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SOCl332 _ASSIGN_2
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Assignment 2: Tests of Significance

 

Throughout this assignment you will review five mock studies. Follow the step-by-step instructions to:   

a.  Enter data from scratch. This assignment DOES NOT use GSS 2012 data set. You need to create a data set for each of the five mock studies by yourself. (Refresh the data entry skill acquired in Week 1.)

b. Go through the five steps of hypothesis testing (as covered in the lesson for Week 6) for EVERY mock study.  

c.  All calculations should be coming from your SPSS. You will need to submit the SPSS output file (.spv) to get credit for this assignment. 

Mock Study 1: t-Test for a Single Sample (20 points)

 

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 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 in the table) obtained after therapy is significantly different from a mean number of activities of 17 that is typical for depressed people. (Clearly list each step).

 

Test the difference at both the .05 and .01 levels of significance.

 

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 (.05 and .01).

Mock Study 2: t- Test for Dependent Means (20 points)

 

1.                   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 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 the numbers of activities of daily living obtained before and after therapy are statistically significant at .05 level of significance. (Clearly list each step).

 

As part of Step 5, indicate whether the researchers should recommend group therapy for all depressed people based on evaluation of the null hypothesis.

Mock Study 3: t-Test for Independent Samples (20 points)

 

1.                   Six months after an industrial accident, a researcher has been asked to compare the job satisfaction of employees who participated in counseling sessions with those who chose not to participate. The job satisfaction scores for both groups are reported in the table below.

 

Use the five steps of hypothesis testing to determine whether the job satisfaction scores of the group that participated in counseling session are statistically different from the scores of employees who chose not to participate in counseling sessions at .01 level of significance. (Clearly list each step).

 

As part of Step 5, indicate whether the researcher should recommend counseling as a method to improve job satisfaction following industrial accidents based on evaluation of the null hypothesis. 

ANOVA (20 points)

Mock study 4

 

1.                   15 clients are placed in three different groups. Clients in Group 1 receives 1 hour of therapy every 2 weeks; clients in Group 2 receives 1 hour of therapy every week; and clients in Group 3 receives 2 hours of therapy every week. Their number of daily activities are recorded in the table on the next page.

 

Use the five steps of hypothesis testing to determine whether the observed differences in the number of activities across three groups are statistically significant at .05 level of significance. (Clearly list each step).

As part of Step 5, indicate whether the researcher should recommend counseling based on evaluation of the null hypothesis. 

Mock study 5-1: Chi-Square Test for Goodness of Fit

 

1.                   The following table includes the primary method of conflict resolution used by 20 students.

 

Method

Aggressive

Manipulative

Passive

Assertive

N of Students

8

2

2

8

 

Following the five steps of hypothesis testing, conduct “goodness of fit” chi-square test to determine whether the observed frequencies in the four cells are significantly different from the expected frequencies at the .05 level of significance. (Clearly list each step).

 

As part of Step 5, indicate whether the observed frequency is significantly different from the expected frequency when equal number of students in each conflict resolution style (20/4=5) is assumed; and what does this mean in regard to this mock study.

Mock study 5-2: Chi-Square Test for Independence

 

1.                   Next, researchers categorized the same group students in the previous study based on the primary method of conflict resolution used and whether that student had been suspended from school for misbehavior.  These data are presented below.

 

Conflict Resolution Method

Suspended

Aggressive

Manipulative

Passive

Assertive

Total

Yes

7

1

1

1

10

No

1

1

1

7

10

Total

8

2

2

8

20

 

Following the five steps of hypothesis testing, conduct chi-square test for independence at the .05 level of significance. . (Clearly list each step).

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