The National Student Research Center

E-Journal of Student Research: Social Studies

Volume 5, Number 3, July, 1997


The National Student Research Center is dedicated to promoting student research and the use of the scientific method in all subject areas across the curriculum, especially science and math.
For more information contact:

John I. Swang, Ph.D.
Founder/Director
National Student Research Center
2024 Livingston Street
Mandeville, Louisiana 70448
U.S.A.
E-Mail: nsrcmms@communique.net
http://youth.net/nsrc/nsrc.html



TABLE OF CONTENTS



  1. Student Opinions About War
  2. Family Size? Which Generation Had The Larger Family Size?
  3. Does Violence In The Media Affect A Student's Behavior?
  4. The Effects of Technology on Learning in the Mentally and Physically Disabled
  5. What Do Students Think About Gun Control?
  6. Student Attitudes Towards Television Violence
  7. Cheapest Gas In The Land
  8. A Survey Project On What Students Know And Feel About Terrorism
   


TITLE:  Student Opinions About War

STUDENT RESEARCHER:  Teresa Kloepfer
SCHOOL:  Mandeville Middle School
         Mandeville, Louisiana
GRADE:  6
TEACHER:  John I. Swang, Ph.D.


I.  STATEMENT OF PURPOSE AND HYPOTHESIS:

I would like to do a scientific research project on what 
students think about war.  My hypothesis states that the 
majority of the students I interview will be against war as 
being a way to solve a nation's problems.

II.  METHODOLOGY:

First, I wrote my statement of purpose, review of literature, 
and hypothesis.  Then I wrote my methodology and developed a 
questionnaire.  Next, I handed 12 of them out to randomly 
selected students at Mandeville Middle School.  When I got the 
questionnaires back I scored them.  Next, I analyzed the data 
by drawing and creating charts and graphs.  Then I wrote my 
summary and conclusion and applied my findings to the real 
world.  Finally, I completed my report and published my 
abstract in a journal of the student research.

III.  ANALYSIS OF DATA:

I sent 12 questionnaires out and received 11 back.  A majority 
of 10 students did not think that war was a good way to solve a 
nation's problems.  Five students were undecided, 4 said no, 
and 2 said yes in regards to attacking Cuba and Haiti to 
restore democracy.  A majority of 8 students said that there 
are better ways to solve problems between nations than war.  
Half the students knew that 23 major wars are happening in the 
90's today.  A majority of 7 knew that countries have stock 
piled enough nuclear weapons today to destroy the entire world.  
A majority of students did not know that Mexico, Canada, and 
Switzerland do not have nuclear weapons.  The majority of the 
students also didn't know the following countries have or are 
thought to have nuclear weapons: U.S.A., India, Ukraine, China, 
France, S. Africa, Russia, N. Korea, Israel, Great Britain, 
Kazakhstan, and Belarus.  A majority of 8 students didn't know 
that more civilians have been killed in war than soldiers.  A 
majority of 8 students agreed that war should be eliminated as 
a way of solving problems in our world today.  Eight out of 11 
students said that there are no good reasons for war.  Sixty-
five percent of the responses to factual questions on my 
questionnaire were incorrect.

IV.  SUMMARY AND CONCLUSION:

Even though students did not know much about war, the majority 
of them were against war as a way of solving a nation's 
problems.  Therefore, I accepted my hypothesis which stated 
that the majority of students I interviewed will be against war 
as a way to solve a nation's problems

V.  APPLICATION:

I could send my findings to the United States Congress to tell 
legislators there what M.M.S. students think about war. The 
legislators should know that students do not think that war is 
a good thing.



TITLE:  Family Size?  Which Generation Had The Larger Family
        Size?

STUDENT RESEARCHERS:  Mr. Carbone's Math class
SCHOOL: North Stratfield School
        Fairfield, Conn.
Grade: 4
TEACHER:  Mr.  V.  Carbone,  M. Ed


I. STATEMENT OF PURPOSE AND HYPOTHESIS:
   
We want to compare our family size to our parents' and 
grandparents' family size.  We think our parents' family size 
is larger than our grandparents' and our own.

II.  METHODOLOGY:

We are going to count the members of our family, our parents' 
family and our grandparents' family.  We defined family to mean 
the following: We will count ourselves,  brothers, sisters, 
parents, and half brothers and half sisters.
We did not count anyone else living in the home.  

III. ANALYSIS OF DATA:

We found out that the average family size for our families was 
4.1.  The 
average family size for our parents' family was 6.2.  The 
average family size for our grandparents' family was 6.3.

IV. SUMMARY AND CONCLUSION:

We found out that our grandparents had larger families than our 
parents and us.  We reject our hypothesis.  

V. APPLICATION TO LIFE:

Here are some reasons why our parents and grandparents had 
larger families.  First of all, it costs more today to have 
children.  Secondly, it is more expensive today to raise a 
family.  Finally, we do not need big families to help out with 
chores on the farm .



TITLE:  Does Violence In The Media Affect A Student's Behavior? 

STUDENT RESEARCHER:  Austin Feldbaum
SCHOOL:  Mandeville Middle School
         Mandeville, Louisiana
GRADE:  6
TEACHER:  John I. Swang, Ph.D.


I.  STATEMENT OF PURPOSE AND HYPOTHESIS:

I wanted to know if violence on television and in the media 
affects a student's behavior.  I also wanted to know whether 
students will be aware of that effect.  There is much conflict 
about violence in the media.  The First Amendment protects 
people's rights to free speech, but citizens continue to 
complain about the amount f violence in the media.  My first 
hypothesis states that violence on television and in the movies 
has a negative effect on a student's behavior.  My second 
hypothesis states that students will know that violence in the 
media can affect their behavior negatively.  

II.  METHODOLOGY:

First, I wrote my statement of purpose.  Then I reviewed  the 
literature on television violence.  Then I developed my 
hypothesis.  After that I wrote a methodology for testing my 
hypothesis.  Then I developed a questionnaire, drew a random 
sample of twelve sixth grade students at M.M.S., and delivered 
the questionnaire to students at my school.  I also sent my 
questionnaire out on the N.S.R.C.'s electronic school district 
to a non-random sample of students around the world.  Next, I 
scored my questionnaires when returned and analyzed my data 
using simple statistics, charts, and graphs.  After that I 
wrote my summary and conclusion where I either accepted or 
rejected my hypothesis.  Finally, I applied what I found to the 
world outside the class room, turned in my abstract, and 
published my research in an electronic journal.

III.  ANALYSIS OF DATA:

I received a total of 168 responses to my survey from students 
in grades 4 through 12.  Sixty-seven of the responses came from 
schools in Canada, Israel, and Finland.  The other 86 responses 
came from Pennsylvania, Rhode Island, California, New York, 
Montana, Illinois, Minnesota, and a random sample of twelve 
sixth grade students at M.M.S in Louisiana.

A majority of 90% of the students get "B's" or higher grades in 
school.  The students were corrected an average of three times 
per day by their teachers.  

A majority of 72% did not think that violence affects their 
behavior.  A majority of 73% thought that violence on cartoons 
and other children's shows can cause younger children to behave 
aggressively.  

A majority of 62% watch three or less hours of TV a day.  A 
majority of 57% said that there is "some to a lot" of violence 
on the TV shows they like to watch.  A majority of 63% of the 
students responding enjoyed watching violence on television and 
in the movies.  A majority of 79% of the students named violent 
actors as their favorites.  A majority of 54% thought that 
violence on television should not be greatly reduced.  A 
majority of 87% thought that violence should not be completely 
cut from the media.  A majority of 78% did not think that 
violence in the media is one of the country's biggest problems.  
The average number of movies with violence that students saw 
over the last month was four.  

A majority of 65% did not think that the best way to protect 
yourself from bullies is to fight.  A majority of 85% did not 
think that violence is an acceptable way to solve problems.  A 
majority of 54% percent of the students though that owning a 
handgun is not a good way to protect your self these days.  A 
majority of 85% percent thought that war is not an acceptable 
way to solve international problems.  

IV.  SUMMARY AND CONCLUSION:

The majority of students were well behaved in class and made 
good grades.  They also say they watch and enjoy violence in 
the media.  They do not think that fighting, violence, war, or 
owning a handgun is a good way to solve problems or protect 
yourself.  Therefore, I reject my first hypothesis which stated 
that violence in the media would have a negative affect on a 
student's behavior.  

The majority of students did not think that violence on TV and 
in the movies affects their behavior, but they did think that 
it affected younger children's behavior, making them more 
aggressive.  Therefore, I reject my second hypothesis which 
stated that the majority of students would think violence in 
the media affected their behavior.

V.  APPLICATION:

My data does not agree with other studies which say that 
violence on TV does affect children's behavior.  I could send 
my findings to researchers to tell them what I found.  I could 
also send my findings to producers that make children's shows 
and recommend that they reduce the amount of violence in them.



TITLE:  The Effects of Technology on Learning in the Mentally
        and Physically Disabled

STUDENT RESEARCHER:  Barry Cecil Karrh
SCHOOL:  The Mississippi School for Math & Science
   P O Box W-1627
   Columbus, MS 39701
GRADE:  12th
TEACHER:  Dr. Lilly Carson-Doty


I.  STATEMENT OF PURPOSE AND INTRODUCTION:

This project is related to educating the mentally and 
physically disabled.  The purpose of the project is to find a 
better way to teach and interact with these students.

For six years, the problem of dwindling "good" education for 
the mentally and physically disabled has inspired me to help 
find new teaching tools that would be available to these 
students at little or no cost.  The main reason I am doing this 
is that the state does not have enough money to purchase the 
computer software needed for their education.  The computer 
programs which I developed are free to the school systems.  I 
want to demonstrate that the software is helpful and usable in 
the classroom.

II.  METHODOLOGY:

In a personal need to help one of my dear friends with Down's, 
I started to develop interactive software based on the Dolch 
Vocabulary and Core Curriculums used in his classes.  In its 
initial development, the programming was designed as a 
communication device, but it purpose grew into a specialized 
programs which would tutor students on anything from English to 
math.  My friend's enthusiasm for the software sparked mine and 
more and more capabilities have been added since its inception.

Complying to suggestions given to me by teachers and 
professionals in the field of mentally and physically disabled 
education, each computer program had to fit the following 
requirements of learning: 1) present a stimulus, 2) allow for a 
trial response, 3)  offer encouragement to try again if the 
trial is wrong, and 4) reward for correct responses.

After developing the computer programs, I went to the classroom 
and conducted research to demonstrate their proficiency by 
actual by letting mentally and physically disabled students use 
them.  I recorded my observations and analyzed my data.

III.  ANALYSIS OF DATA:

In the first year of this study where students used the 
computer programs, average test scores of fifty-seven percent 
at the beginning of the school year increased to sixty percent 
at the end of the year.  In the second year, average test 
scores of seventy nine percent at the beginning of the year 
increased to ninety percent.  In the third year of the study, 
average test scores remained at ninety-seven percent.  
Classroom test scores continued to increase over the entire 
course of the research project, as well as conventional social 
skills developed from the students having to share the 
computers.

IV.  SUMMARY AND CONCLUSION:

The students greatly enjoyed using the computer programs and 
continued to use them even after my testing finished for the 
year.  Many of students even asked to have computer programs 
for use in their homes.  Their principals of their schools 
asked for these programs to be left in the classrooms and 
welcomed further testing.  

One can not just say that something works well.  It must be 
tested and studied for proficiency and dependability.  Because 
this project has spanned six years, there has been continual 
testing and monitoring of the computer programs.  Statistical 
tests have demonstrated that average test scores of students 
have increased from their original below average passage rate 
to significantly higher passing scores.  The long and tedious 
tests along with the continued supervision of teachers and 
over-seers have not just stated, but emphatically "shouted," 
the praises of these programs to the school board and other 
teachers, proving the benefits of this new way of teaching 
mentally disabled students.

V.  APPLICATION:

The applications for these computer programs could go beyond 
the classroom to situations of rehabilitation for the mentally 
and physically disabled.  They could also be use for 
communication with the deaf or mute.  They could be used in 
nursing homes or private residence as well.  Research and 
development projects of this nature rarely give rewards of high 
status or prestige, but seeing the students learn and interact 
with their new tutor, my computer program, is reward in full.



TITLE:  What Do Students Think About Gun Control?

STUDENT RESEARCHER:  Austin Feldbaum
SCHOOL:  Mandeville Middle School
         Mandeville, Louisiana
GRADE:  6
TEACHER:  John I. Swang, Ph.D.


I.  STATEMENT OF PURPOSE AND HYPOTHESIS:

I wanted to know more about what students think of gun control.  
Gun control is a big issue in America today.  Seven out of 
eight U.S. citizens are for stronger gun control laws.  Yet 
over the years the public's opinion has had little effect on 
Congress.  My hypothesis states that the majority of students I 
survey will be for stricter gun control laws.

II.  METHODOLOGY:

First, I wrote my statement of purpose.  Then I did my review 
of literature and developed my hypothesis.  Next, I developed 
my questionnaire, drew a random sample of twelve sixth grade 
students at M.M.S. and administered my survey to them.  I also 
sent my questionnaire out over the N.S.R.C.'s electronic school 
district to a non-random sample of students from all over the 
world.  Then I scored my questionnaires when returned, recorded 
my data on a data collection sheet, and analyzed my data with 
simple charts and graphs.  Then I wrote my summary and 
conclusion.  Next, I applied what I found to the world outside 
my classroom.  Finally, I wrote an abstract of my research and 
published it in a journal of student research. 

III.  ANALYSIS OF DATA:

I received a total of 878 responses to my survey from students 
in grades 4 through 12.  Two were from Israel and Canada.  The 
others came from schools in Wisconsin, Louisiana, South 
Carolina, Illinois, Texas, California, Washington, Alabama, 
Arizona, Utah, and New York.  

A majority of 72% thought that citizens should be allowed to 
own guns in their homes.  A majority of 64% agreed with 
Congress' decision to ban assault rifles.  A majority of 80% 
agreed with a seven day wait before the sale of a handgun.  A 
majority of 58% did not think that Congress should ban rifle 
clips with over five bullets.  A majority of 73% thought that 
gun control is one of the country's biggest problems.  A 
majority of 87% did not think that Congress should ban all 
firearms.  A majority of 78% thought that there should be 
mandatory jail sentences for all crimes involving the use of 
handguns.  A majority of 85% thought that there should be 
longer jail sentences for second-time gun offenders.  A 
majority of 58% did not keep a hand gun in their home.  A 
majority of 74% thought that the national government and the 
state governments should write and passed gun control laws.

IV.  SUMMARY AND CONCLUSION:

The majority of the students surveyed believe that citizens 
should be allowed to have guns in their homes, but they 
themselves did not have guns in their homes.  The majority of 
students think that gun control is one of our country's main 
problems.  In general, they think that there should be stricter 
gun control laws written by the federal or state governments.  
Therefore, I accept my hypothesis which stated that the 
majority of the students would be for stricter gun control 
laws.

V.  APPLICATION:

I will send what I found to the U.S. Congress and state 
governments to tell legislators there what sixth grade students 
at M.M.S. and around the country think about gun control.  It 
could be of help to them as they debate this problem and try to 
solve it.



TITLE:  Student Attitudes Towards Television Violence

STUDENT RESEARCHERS:  Michael Placito, Meredith Reiley, Mike
                      Panteleo
SCHOOL:  Mandeville Middle School
         Mandeville, Louisiana
GRADE:  6
TEACHER:  John I. Swang, Ph.D.


I.  STATEMENT OF PURPOSE AND HYPOTHESIS: 

We want to do a survey research project on how students feel 
about television violence.  Our hypothesis states that the 
majority of the students who respond to our questionnaire will 
not know that children's programming has twenty-eight more 
violent acts per hour than prime time.

II.  METHODOLOGY:

First, we wrote our statement of purpose and reviewed our 
literature on television violence.  Second, we developed a 
questionnaire.  We then drew random samples of the 6th grade 
students and administered our questionnaire to them.  We also 
sent the questionnaire out onto the National Student Research 
Center's electronic school district.  Once we received the 
answered questionnaires, we scored them.  Then we analyzed our 
data, wrote our summary and conclusions where we accepted or 
rejected our hypothesis, then we applied our findings to 
everyday life.

III.  ANALYSIS OF DATA:

In total, we received 141 responses to our questionnaire.  We 
received 39 responses from Mandeville Middle School in 
Mandeville, Louisiana, one from Hawaii, one from Ontario, 
Canada, two from Utah, 19 from Michigan, 22 from British 
Columbia, Canada, 25 from Missouri, and 32 from California.

According to our data, a majority of 60% of the students 
surveyed did not think that there is too much violence on 
television, yet a majority of 53% of the students thought that 
television creates a violent image of the world.

A majority of sixty-eight percent of the students surveyed say 
that television does not have a bad influence on them and other 
students in their schools.  Although a majority 63% of the 
students felt that violent television make other people more 
aggressive.

A majority of sixty-one percent of the students surveyed 
incorrectly said that Saturday morning cartoons for children 
are not violent.  A majority of seventy-eight percent 
incorrectly thought that children's TV programming is not as 
violent as prime time.  A majority of fifty-five percent did 
not know that there are about 28 more violent acts per hour in 
children's programming than in prime time TV.  A majority of 
78% of the students incorrectly thought that children's TV 
programming is not as violent as prime time TV.  A majority of 
seventy percent of the students did not know that children's TV 
programming is the most violent broadcasts on television.

A majority of 69% agree that TV violence influences how young 
children behave.  A majority of eighty-three percent think that 
small children cannot tell the difference between TV fantasy 
and reality.

A majority of eighty-four percent of the students surveyed knew 
that the V-chip is an electrical component that allows parents 
to block-out violent television shows.  A large majority of 85% 
of the students had noticed parental advisories before 
excessively violent television shows.  A majority of eighty 
percent of the students think that the parental advisories are 
good ideas.

IV.  SUMMARY AND CONCLUSION:

Students think that there isn't too much violence on 
television.  They think that violent television makes people 
more aggressive.  They incorrectly believe that children's TV 
programming is not as violent as prime time TV.  The students 
think that small children can not tell the difference between 
TV fantasy and reality, therefore they are negatively 
influenced by violent television.  They believe that warning 
labels are good ideas.  Since 55% of the students did not know 
that there are about 28 more violent acts per hour in 
children's TV programming than in prime time TV, we accept our 
hypothesis.

V.  APPLICATION:

We have learned that students deny that there is a significant 
amount of violence on television.  Teachers need to make their 
students more aware of the violence on television and its 
effect upon them.  From what we've learned, students approve of 
parental advisories, but are ignorant of the fact that there is 
a large amount violence on children's television programming.  
Perhaps students would approve of parental advisories before 
children's cartoons and TV shows.



Title:  Cheapest Gas In The Land

Student Researchers:  Mr. Carbone's Math Class
School:  North Stratfield School
         Fairfield, Connecticut
Grade:  4
Teacher:  Mr. V. Carbone


I. STATEMENT OF PURPOSE AND HYPOTHESIS:

We want to find out which state sells the cheapest gas.  Our 
hypothesis states that Georgia sells the cheapest gas.

II. METHODOLOGY:

We will ask other schools to join us in this project.  They 
will provide information from their state on gas prices.  We 
will get the following information: regular, unleaded, and 
super.  If we are provided with more than one set of prices 
from one town, we will use the cheapest set for our data.

III. ANALYSIS OF DATA:

Town, State          Regular         Unleaded         Super

Prescott, Arizona      $1.10            $1.12           $1.19
N. Hampton, Mass.      $1.13            $1.29           $1.39
Georgetown, Kentucky   $ .99            $1.01           $1.05
Huntsville, Texas      $1.19            $1.23           $1.32
West Palm Beach, FL.   $1.19            $1.29           $1.37
Mandeville, LA.        $1.09            $1.19           $1.30
Mansville, Mass.       $----            $1.29           $1.41
Georgia                $1.09            $----           $----
Salisbury, MD          $1.15            $----           $----
Waco, Texas            $1.02            $1.12           $1.19
Luling, LA             $ .99            $1.08           $1.18
Fairfield, CT          $1.29            $1.39           $1.49
Salt Lake City Utah    $1.03            $1.11           $1.13
Miami, FL              $1.19            $----           $1.28
Ludlow, Vermont        $----            $1.12           $1.29
Ocean City, Maryland   $1.07            $1.17           $1.29
West Dover, Vermont    $1.09            $1.15           $1.23
Yonkers, New York      $1.29            $----           $1.47
Greensfield, Mass.     $1.23            $1.33           $1.42
Willington, Vermont    $1.06            $1.10           $1.17
Atlanta, Georgia       $ .95            $1.09           $1.19

IV. SUMMARY AND CONCLUSION:

We accept our hypothesis for regular gas.  Georgia had the 
least expensive gas for regular unleaded at $ .95.  We reject 
our hypothesis for midgrade unleaded and super unleaded.  
Kentucky had the cheapest gas prices in these areas at $1.01 
midgrade unleaded and $1.05 for super.

V. APPLICATION TO LIFE:

1) If you were going on a trip, you might want this information 
for your expenses.  2) Other gas stations might want to know 
these prices so they are not too expensive.  3) If you were 
driving from one state to another on a trip, you might want to 
wait and fill up in the other state if the gas prices there are 
less expensive.  4) If you were moving to another state, you 
might want to know the price of gas in that state.



TITLE:  A Survey Project On What Students Know And Feel About
        Terrorism

STUDENT RESEARCHERS:  Graham Rees, Krysta Ferguson, Kyle
                      Driscoll, and Paul Dearing
SCHOOL:  Mandeville Middle School
         Mandeville, Louisiana
GRADE:  6
TEACHER:  John I. Swang, Ph.D.


I.  STATEMENT OF PURPOSE AND HYPOTHESIS:

We would like to do a survey research project on what students 
think and know about terrorism.  We want to know how safe they 
feel in their home towns.  Our hypothesis states that the 
majority of students surveyed will feel safe from an act of 
terrorism.

II.  METHODOLOGY:

First, we wrote our statement of purpose.  Second, we reviewed 
the literature on terrorism, developed our hypothesis, and 
wrote our methodology.  Third, we developed a questionnaire, 
drew a random sample of sixth grade students at Mandeville 
Middle School, and administered the questionnaires to them.  
Also, we sent the questionnaire out on the NSRC's Electronic 
School District on the Internet to students around the world.  
Fourth, we scored the questionnaires when they were returned, 
analyzed the data, and wrote our summary and conclusion where 
we rejected or accepted our hypothesis.  Then we applied our 
findings to the world outside the classroom.

III.  ANALYSIS OF DATA:

We received a total of 44 e-mail responses to our 
questionnaire.  We received 15 responses from Canada, 1 
response from Iowa, 26 responses from California, and 2 
responses from Utah.  We received a total of 50 responses from 
6th grade students at Mandeville Middle School in Mandeville, 
Louisiana.  We received a total of 94 responses to our 
questionnaire.

A majority of 79% of the students who responded to our 
questionnaire said that they were knowledgeable about 
terrorism.  Seventy-three percent said that they knew how to 
protect themselves from terrorist acts.  Seventy-nine percent 
never witnessed a terrorist act in the area they live in.  
Fifty-nine percent felt safe from terrorist acts.  A majority 
of the students knew that hijacking, political assassinations, 
the taking of hostages, bombings, kidnapping, and setting fires 
are examples of terrorism.  Eighty-two percent did not know 
that the first known terrorist acts occurred in Spain and 
Italy.  Fifty-nine percent did not know that Encarta '95 
reported that between one thousand and one million people have 
died from terrorist acts in the last three hundred years.  
Seventy-nine percent agreed that terrorism is a major problem 
in America.  A small majority of 51% agreed that terrorism is a 
solvable problem.  Fifty-five percent did not know that it is 
estimated that there are approximately 550 terrorist groups 
around the world.  A majority of 92% knew that the Oklahoma 
City bombing in the USA was an act of terrorism.  A small 
majority of 53% did not think that world governments are doing 
a good job of stopping terrorism.

IV.  SUMMARY AND CONCLUSION:

We found out that a majority of the students were somewhat 
knowledgeable about terrorism and said they knew how to protect 
themselves from terrorist attacks.  They never witnessed a 
terrorist act in the area they live in, but thought terrorism 
was a major problem.  They thought that terrorism is a solvable 
problem which world governments are not adequately addressing.  
They also felt safe from terrorist acts.  Therefore, we accept 
our hypothesis which stated that the majority of students will 
feel safe from an act of terrorism.       

V.  APPLICATION:

Most students felt safe from terrorist acts, said they knew how 
to protect themselves from terrorist acts, and said they were 
knowledgeable about terrorism.  However, 50% of the responses 
to our factual questions on our questionnaire were incorrect.  
Therefore we can apply our findings by telling teachers to 
educate their students more about terrorism.  They do not know 
as much about terrorism as they think they do.  We can also 
send letters to world governments and tell them to put more 
time, money, effort, and thought into stopping terrorism.

© 1997 John I. Swang, Ph.D.