Case Study: Psychology Statics Help

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Case Study: Psychology Statics Help

Case Study: Psychology Statics Help

Single Sample & Dependent Samples t Tests

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SPSS instructions: (For more details, check the links provided under “Course Materials” in the Course Overview Folder (under Lessons).

t Test for a Single Sample:

Open SPSS

Enter the number of activities of daily living performed by the depressed clients studied in #1 in the Data View window.

In the Variable View window, change the variable name to “ADL” and set the decimals to zero.

Click Analyze ( Compare Means ( One-Sample T test ( the arrow to move “ADL” to the Variable(s) window.

Enter the population mean (14) in the “Test Value” box.

Permalink:

Click OK.

t Test for Dependent Means:

Open SPSS

Enter the number of activities of daily living performed by the depressed clients studied in Problem 2 in the Data View window. Be sure to enter the “before therapy” scores in the first column and the “after therapy” scores in the second column.

In the Variable View window, change the variable name for the first variable to “ADLPRE” and the variable name for the second variable to “ADLPOST”. Set the decimals for both variables to zero.

Click Analyze ( Compare Means (Paired-Samples T Test (the arrow to move “ADLPRE” to the Paired Variable(s) window ( “ADLPOST” and then click the arrow to move the variable to the Paired Variable(s) window.

Click OK.

Review the five steps of hypothesis testing and complete the following problems. Be sure to cut and past the appropriate result boxes from SPSS under each problem.

1. Researches are interested in whether depressed people undergoing group therapy will perform a different number of activities of daily living after group therapy. The researchers have randomly selected 12 depressed clients to undergo a 6-week group therapy program.

Use the five steps of hypothesis testing to determine whether the average number of activities of daily living (shown below) obtained after therapy is significantly different from a mean number of activities of 14 that is typical for depressed people. (Clearly indicate each step).

Test the difference at the .05 level of significance and, for practice, at the .01 level (in SPSS this means you change the “confidence level” from 95% to 99%).

In Step 2, show all calculations.

As part of Step 5, indicate whether the behavioral scientists should recommend group therapy for all depressed people based on evaluation of the null hypothesis at both levels of significance and calculate the effect size.

CLIENT

AFTER THERAPY

A

17

B

15

C

12

D

21

E

16

F

18

G

17

H

14

I

13

J

15

K

12

L

19

2. Researchers are interested in whether depressed people undergoing group therapy will perform a different number of activities of daily living before and after group therapy. The researchers have randomly selected 8 depressed clients in a 6-week group therapy program.

Use the five steps of hypothesis testing to determine whether the observed differences in numbers of activities of daily living (shown below) obtained before and after therapy are statistically significant at the .05 level of significance and, for practice, at the .01 level. (Clearly indicate each step).

In Step 2, show all calculations. As part of Step 5, indicate whether the researchers should recommend group therapy for all depressed people based on evaluation of the null hypothesis at both levels of significance and calculate the effect size.

CLIENT

BEFORE THERAPY

AFTER THERAPY

A

12

17

B

7

15

C

10

12

D

13

21

E

9

16

F

8

18

G

14

17

H

11

8

The deadline for this assignment is 11:59 PM EST on Sunday of Week 5

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