School

Blinn College **We aren't endorsed by this school

Course

MATH MISC

Subject

Statistics

Date

Aug 22, 2023

Pages

4

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1
Using Experimental Designs for Conducting Research
Criteria: (a) Define Population (i.e. Students at a Southeastern university
who want to improve their study skills and enroll in the Student Success
Initiative, about 1500 (b) Conduct a Power Analysis (what will your sample
be (n= 100); (c) randomly select sample from 100, and (d) randomly assign
to two groups, experimental and control (n - 50)
1.
Choose a topic
: How motivation affects students' academic performance
2.
Select a sample
, college students.
3.
Conduct research
.
a.
Motivation - operationalize (See LASSI-2 to start)
b.
Overall motivation
c.
Motivation by Gender
d.
Motivation by Ethnicity
e.
Intervention programs and efficacy of programs.
4.
Develop a hypothesis from literature
. College students enrolled in the Student
Success Initiative Program will increase their motivation and this may improve
their academic performance.
5.
Theory. Use a theory to understand how motivation impacts academic
performance (i
.e. Self-Determination Theory [SDT], Ryan & Deci, 2019).
6.
Research Question.
Is there a statistically significant difference between students
who participated in the Student Success Initiative and students who did not
participate in the Student Success Initiative on motivation levels?
7.
Ho There is no difference between
students who participated in the Student
Success Initiative and students who did not participate in the Student Success
Initiative on motivation levels?
8.
Ha: There is a difference between
students who participated in the Student
Success Initiative and students who did not participate in the Student Success
Initiative on motivation levels?
9.
How will Motivation be measured? The LASSI
The Learning and Study Strategies
Inventory (LASSI-II, 2nd edition) (Weinstein & Palmer, 2002) was used for
collecting data from students. Specifically, the subscale for motivation was used
for this research.
10.Design
. A between subjects experimental design (treatment vs. control) was used
to select participants
11.Students were recruited
by advertisements in the student newspaper for the
Student Success Initiative, a program designed to assist students succeed in
college.
12.A power analysis
indicated that 100 participants were needed to find statistical
significance with a medium effect size. The rest of the students participated in the
program, but, were not part of the study.
13.A Table of Random Numbers (Appendix B) was used to (a) randomly select a
sample of 100. Subsequently, 50 participants were assigned to group A
(treatment) and group B (control).
14.Data were gathered with the LASSI_2 Motivation subscale.

2
15.Data were analyzed to answer the research question.
Is there a statistically
significant difference between students who participated in the Student Success
Initiative and students who did not participate in the Student Success Initiative on
motivation levels?
16.Results and Interpretation.
PROBABILITY SAMPLING/ NONPROBABILITY SAMPLE SELECTION
Probability - Test the Null Hypothesis
Probability sampling - What is the probability that you would reject the null
hypothesis? We are testing the null hypothesis
Research Question.
Is there a statistically significant difference between students who
participated in the Student Success Initiative and students who did not participate in the
Student Success Initiative on motivation levels?
Identify Independent variable. How many levels? Identify Dependent variable.
*concentration*
Identify 4 levels of measurement? Which level of measurement is used for IV? Which
level of measurement is used for DV?
1.
Nominal - gender
2.
Ordinal - ranking order
3.
Interval - 1-100
4.
Ratio - height, weight (absolute)
How will motivation be measured?
*interval*
What is example of questions? What are
the anchors for questions?
*how they collected the data*
What is population?
What is sample? How to select sample.
How many are needed?
G*Power statistical analysis
http://www.gpower.hhu.de/en.html
Typically, for an experimental design, 30 in each group.
For this analysis, we will use 50 in each group (Treatment, Control) for a total of n=100.
Population
- all of the students that signed up (n = 1800)
Sample
- n = 100
Control
= 50
Treatment
= 50
Control students placed on Wait List to participate in Student Success Initiative next
semester

3
Simple Random Sample
Define Population (All participants who signed up for SSI) = 1800
Prepare List of all students and number them
Refer to Table of Random Numbers OR Use cell phone and go to random numbers
generator range 1-1800, select the first 100.
Randomly assign to Treatment Group and Control Group
Use Random Number Generator
1
st
50 go to Treatment Group, rest assigned to Control
Stratified Sampling
Want an n = 100; 25 in each group
By Classification (Freshman [40% of 1800 = 720]; Sophomores [35% of 1800 = 630],
Juniors [10% of 1800 = 180[ and Seniors [15% of 1800 = 270].
Refer to Random Number Generator
Select (i.e. select 25 out of 720 for Freshman.......
Cluster Sampling
Define clusters by zip codes
Make a directory of those students (i.e. 77341, 78345, 76451,,,,,)
If 15 clusters, randomly select 5 clusters
Systematic Sampling
Develop a list of 1800 students.
Select every 10
th
person to participate.
Homework
Assignment. Use simple Random Selection and Assignment for answering the research
question. Is there a difference between Poverty Simulation participants and Poverty
Simulation non-participants on amount of empathy?
What is IV?
Poverty Simulation participants/non-participants
What is DV?
empathy
What level of measurement is IV?
Nominal
What level of measurement is DV?
Interval
How will you collect information on empathy?
Interval level (continuous)
Population - Students at RELLIS in the TAMUK program
population (n = 60)
Treatment Group = _
30
_, Control Group = _
30
_
Provide Steps.
Use Stratified Sampling.
Male/female, different schools, etc.
Use Cluster Sampling
zip codes

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