#### Question Details

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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