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# Assignment 6 - Soci 332 American Military university Statistics for social science

Submit the following files to the Drop Box no later than Sunday of Week 6:
Word file (this file) saved as [your last name]_SOCI332_Weekly Assignment 6.doc
SPSS output file (.spv) saved as [your last name]_SPSS-week6_output

The deadline for this assignment is 11:59 PM EST on Sunday of Week 6

WEEKLY ASSIGNMENT 6

Enter your answers in the spaces provided. Save the file using your last name as the beginning of the file name (e.g., Krieger_SOCI332_Weekly Assignment 6.doc) and submit via “Assignments.” When appropriate, show your work. You can do the work by hand, scan/take a digital picture, and attach that file with your work.

Mental Math (10 points)
1. A manager of a small store wanted to discourage shoplifters by putting signs around the store saying “Shoplifting is a crime!” However, he wanted to make sure this would not result in customers buying less. To test this, he displayed the signs every other Wednesday for 8 weeks, for a total of 4 days displayed. He recorded the store’s sales for those four Wednesdays and then recorded the store’s sales for the four alternate Wednesdays, when the signs were not displayed. On the Wednesdays with the sign, the sales were 83, 73, 81, and 79. On the Wednesdays without the sign, sales were 84, 90, 82, and 84.
Do these results suggest that customers buy less when the signs are displayed? (Use the .05 significance level.)
a. Use the five steps of hypothesis testing.
b. Sketch the distribution involved.
c. Figure the effect size.
d. Explain what you did to a person who is familiar with the t test for a single sample but is unfamiliar with the t test for independent means.

SPSS Assignment (10 Points)

The t Test for Independent Samples

SPSS instructions to run the t Test for Independent Samples: (For more details, check the links provided under “Course Materials” in the Course Overview Folder (under Lessons).

Once you have entered the data, click on Analyze, then on Compare Means, and then click on Independent-Samples T Test…

A dialog box will appear, with your variables (student, condition, score) on the left. Your options are (a) move one or more variables into the “Test Variable(s)” box to select your dependent variables(s) and (b) move one of your variables into the “Grouping Variable” box to select the independent variables (or identify the groups to be compared).

Make “?” the dependent variable by moving it to the “Test Variable(s)” box. Then make “?” your independent variable by moving it to the “Grouping Variable” box. Now, the “Define Groups” button is functioning, click on Define Groups and another dialog box appears. Here you must specify the two values of the condition variable that represent the two groups you are comparing. Click in the box next to Group 1 and type the number 1, then click in the box next to Group 2 and type the number 2. Now you can click Continue to return to the “Independent-Samples T Test” dialog box, and click on OK to run the analysis.

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 the satisfaction of employees who chose not to participate.

The scores on a job satisfaction inventory for both groups are listed 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 are statistically higher than the scores of employees who did not participate in counseling at the .01 level of significance.

In Step 2, show all calculations.

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 and calculate the effect size. NOTE: Do not forget to give a numeric value for those who participated in counseling (e.g. 0) and those who did not participate in counseling (e.g. 1).

PARTICIPATED IN COUNSELING
DID NOT PARTICIPATE IN COUNSELING
36
37
39
35
40
36
36
33
38
30
35
38
37
39
39
35
42
32

Submit the following files to the Drop Box no later than Sunday of Week 6:
⎫ Word file (this file) saved as Krieger_SOCI332_Weekly Assignment 6.doc
⎫ SPSS output file (.spv) saved as Krieger_SPSS-week6_output

The deadline for this assignment is 11:59 PM EST on Sunday of Week 6

Attached Files