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Answered: - Im confused on this section. I need help with number 1. a-h
Im confused on this section. I need help with number 1. a-h
PSY 280 Spring 2016
Write your name on the back of the last page
Homework 7
1. A researcher was interested in whether an educational video on the importance of exercise
had an effect on the number of times per week that college students exercised. To examine
this issue, a research study was conducted in which a group of college students were shown
an educational video on the importance of exercise, then the number of times the students
exercised in the following week was compared to the number of days students at the college
exercise per week. It is known that the average number of times per week students at the
college exercise is 3.5. Below are data from the group of students who watched the
educational video about the importance of exercise. Use this data to answer the question:
Does the educational video make a difference on the number of times per week that college
students exercise?
Times
Exercised
Per Week
Pnum
(x-m)2
1
8
16
2
5
1
3
1
9
4
5
1
5
4
0
6
3
1
7
2
4
8
3
1
9
5
1
10
4
0
M=4
34 SS
3.78 s2
1.94 s
a. What are the independent variable (with the levels) and the dependent variable of the
study? 1 point
b. Step 1: Write the null and research hypotheses in symbols. .5 points
PSY 280 Spring 2016
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c. Calculate the standard error. 1 point
d. Step 2: Find the critical value for the test statistic? 1 point
e. Step 3: Find the obtained (i.e., computed) test statistic for a sample (n=10) with a
mean of 4? 1 point
f. Step 4: Make a statistical decision about the null. Will you reject or retain the null
based on your sample data? (Be sure to include appropriate test statistic and decision
criteria). 1 point
g. Step 4 (continued): Provide a substantive conclusion about the results from your
sample data. (Be sure to include the research context and descriptive statistics). 1
point
h. Continuing with this example, (i.e. the same population mean, etc.), calculate the
effect size of the educational video (those who watched the video compared to those
who did not watch the video) on the number of times college students exercise per
week (using Cohen?s d). How large of an effect size is this, small, medium, or large?
1.5 points
2. You are conducting an experiment to examine whether interpersonal therapy makes a
difference in symptoms in a sample of war veterans diagnosed with post-traumatic stress
disorder (PTSD). A standard measure of PTSD is known to produce a ? of 20. A sample of
PSY 280 Spring 2016
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64 war veterans diagnosed with PTSD was given 8 weeks of interpersonal therapy. After the
8 weeks, the sample mean PTSD score was 16 (M=16) and the s = 7.
a. What are the independent variable (with the levels) and the dependent variable of the
study? 1 point
b. Step 1: Write the null and research hypotheses in symbols. .5 point (Take off for sample
symbols)
c. Calculate the standard error. 1 point
d.
Step 2: Find the critical value for the test statistic? (Use largest [i.e., most conservative]
value if exact value not given in the chart) 1 point
e. Step 3: Find the obtained (i.e., computed) test statistic for a sample (n=64) with a mean
of 16? 1 point
f. Step 4: Make a statistical decision about the null. Will you reject or retain the null based
on your sample data? (Be sure to include appropriate test statistic and decision criteria).
1 point
g. Step 4 (continued): Provide a substantive conclusion about the results from your sample
data. (Be sure to include the research context and descriptive statistics). 1 point
PSY 280 Spring 2016
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3. A researcher designed a study to examine the effect of a new reading program on the number
of books read over the summer by 2nd graders. Typically 2nd graders read 3 books over the
summer. The researcher recruited a sample of 20 2nd graders and they participated in the new
reading program (e.g., they win a prize for every book read over the summer). The
researcher wants to know if the new reading program is effective. The following are the
number of books read over the summer by students in the new reading program. Enter the
data into SPSS. Use this dataset to test the question: Does the new reading program make a
difference in the number of books read over the summer by 2nd graders?
Pnum
Number of Books Read Over the Summer
1
4
2
6
3
4
4
10
5
3
6
4
7
2
8
4
9
7
10
5
11
8
PSY 280 Spring 2016
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12
0
13
4
14
9
15
3
16
1
17
6
18
2
19
5
20
3
a. What are the independent and dependent variables of the study? 1 point
b. What are the null and research hypotheses (in symbols)? .5 point
c. Conduct the appropriate statistical test in SPSS. Go to Analyze/Compare Means/OneSample t-test. In the box labeled ?Test Value?, enter 3 instead of 0. Print output and
include it with your homework. 1 point
d. From the output, report the test statistic and the probability (obtained p-value).
Remember to include degrees of freedom when you report t-values. 1 point
e. Make a statistical decision about the null. Will you reject or retain the null based on the
SPSS output (Remember to use #s from the output only to make your statistical
conclusion. If you use a critical t, you will get no points.). 1 point
PSY 280 Spring 2016
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f. Provide a substantive conclusion about the results from your sample data. (Be sure to
include the research context and descriptive statistics). 1 point
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