SPSS 7 and 8

SPSS Homework 7 Instructions

Chi Square

Part 1:

Green & Salkind: Lesson 40, Exercises 1–4

The following helpful tips are numbered to correspond with the exercise number to which they refer (a dash indicates that no tips are needed):

1. Use the method reviewed in the presentation to weight the cases for this data set. (no points—done in data file)

2. Do a, b, and c. (2 pts for output and 2 pts each for a–c)

3. ---------- (2 pts)

4. All homework “Results sections” must follow the example given in the Course Content document “Writing Results of Statistical Tests in Current APA Format” (Note: you do not have to refer to a figure). (2 pts)

Green & Salkind: Lesson 41, Exercises 1–3

The following helpful tips are numbered to correspond with the exercise number to which they refer (a dash indicates that no tips are needed):

NOTE: This exercise does not use the weighted cases method. Use the data file “as is.”

1. Do a, b, c, d, and e. For letter “e,” this question is asking specifically about effect size. (2 pts for output and 2 pts each for a–e)

2. ---------- (2 pts)

3. All homework “Results sections” must follow the example given in the Course Content document “Writing Results of Statistical Tests in Current APA Format” (Note: you do not have to refer to a figure). (2 pts)

Part 2:

1. An industrial/organizational (I/O) psychologist is helping a company determine the type of work stations preferred by its employees. The business owner believes that people who work in different departments may prefer different work station layouts. In order to examine this claim, the I/O psychologist sets up 3 simulated work stations: private office (PO), semi-private office (SPO), and open floor plan (OFP). She recruits employees from 3 different departments: Information Technology, Human Resources, and Marketing. The participants spend 30 minutes in each simulated work station performing general pre-arranged tasks. At the end of the 1.5 hours, the participants turn in a form on which they mark which work station they prefer. The results are listed in the table on the following page. Perform a chi square test of independence (using an SPSS two-way contingency table analysis) to determine whether the proportions of work station preferences differ across departments. Use the weighted cases method.

The steps will be the same as the ones you have been practicing in Part 1 of the assignment—the only difference is that you are now responsible for creating the data file as well. Remember to name and define your variables under the “Variable View,” then return to the “Data View” to enter the data. (2 pts)

	Private Office	Semi-Private Office	Open Floor Plan	TOTAL
Information Technology	9	6	4	19
Human Resources	6	10	3	19
Marketing	7	3	9	19
TOTAL	22	19	16	57

2. Create a clustered bar graph depicting your results. (2 pts)

3. Write an APA-style Results section describing the outcome. All homework “Results sections” must follow the example given in the Course Content document “Writing Results of Statistical Tests in Current APA Format” (Note: you do not have to refer to a figure). (2 pts)

Part 3: Cumulative Homework

1. A researcher wants to find out if the number of absences from a chemistry class are predictive of final exam scores at a local university. The data from the past term are in the table below. Are number of absences predictive of final exam scores? Choose the correct test to analyze this question, set up the SPSS file, and run the analysis. Follow the directions on the following page.

Number of Absences	Final Exam Scores
1 1 2 3 4 5 5 5 6 6 6 7 7	98 95 89 89 80 85 80 75 76 69 70 62 60

a) Paste appropriate SPSS output. (2 pts)

b) Paste appropriate SPSS graph. (2 pts)

c) Write an APA-style Results section describing the outcome. All homework “Results sections” must follow the example given in the Course Content document “Writing Results of Statistical Tests in Current APA Format” (Note: you do not have to refer to a figure). (2 pts)

AND SPSS 8

SPSS Homework 8 Instructions

Nonparametric Tests

Part 1:

1. Green & Salkind: Lesson 42, Exercises 1, 3–4

The following helpful tips are numbered to correspond with the exercise number to which they refer (a dash indicates that no tips are needed):

1. This research scenario will be familiar to you. Do letters a, b, and c, answering the questions beneath your SPSS output. (3 pts for output and 2 pts each for a–c)

3. All homework “Results sections” must follow the example given in the Course Content document “Writing Results of Statistical Tests in Current APA Format” (Note: you do not have to refer to a figure). (4 pts)

4. Create a boxplot as done in earlier modules/weeks. (3 pts)

2. Spearman Rho Exercise: This exercise is not found in Green & Salkind. Open the data file “Mod8_SpearmanRho_Exercise File” in the Module/Week 8 SPSS Assignments folder in Blackboard and read the following information; answer the questions below.

Scenario: During the Vietnam War, a draft was put in place that selected young men born on certain dates and placed them in the armed services. The process proceeded via lottery: Dates like “Sept. 14” were placed in capsules, one for each of the 365 days of the year, and the capsules were then drawn randomly from a container. In the 1970 draft, Sept. 14 was the first date drawn, meaning that all young men born on Sept. 14 were eligible for the very first round of the draft, and so on. After the results of the 1970 draft were analyzed, many statisticians and politicians asserted that the process had not been random at all, and certain men had a higher chance of being drafted than others. This case is famous, making it to the pages of international newspapers and the U.S. Supreme Court.

In the SPSS data file in Blackboard, you will find the original 1970 draft data with two variables. Column 1 contains the consecutive day of the year (1 = Jan. 1; 2 = Jan. 2; and so on). Column 2 contains the draft rank (1 = first date drawn; 2 = second date drawn; and so on). So, in the first row of the data set, Day 1 (Jan. 1) had a draft rank of 305. The lower the draft rank, the sooner and more likely a man was to be drafted. So, a higher rank (like 305, for example) was preferable to those who did not want to be drafted right away.

If the process had been statistically random, there would be no correlation between the day of the year you were born and the rank that was assigned to you (r = 0). Any type of significant correlation would mean that there was something relating the variables beyond mere random error, or chance.

1. Open the data file and perform a Spearman correlation analysis for the day of year and the draft rank. Paste your output in the homework document. (2 pts)

2. Write a current APA-style results section describing the outcome. (2 pts)

3. Answer the next two questions in “layman’s terms” as if for someone who does not know much about statistics: (a) Why did people accuse the process of not being random? (b) What do the data indicate for men born earlier in the year vs. men born later in the year? (2 pts)

It’s not required, but if you want to check out the original New York Times article and see an interesting graph, go to this link: http://frewm.wikispaces.com/file/view/nytimes.pdf

(Data file source: http://www.amstat.org/publications/jse/v5n2/datasets.starr.html#rosenbaum1)

Part 2:

1. A university assessment department collects data to determine whether class ranking differs between male and female students. Based on the top 12 males and top 12 females of the senior class, is there a difference between genders on where they are ranked in their class? Perform a Mann-Whitney U test, being sure to follow the directions on the following page. (3 pts)

Male	Female
2 5 7 10 11 13 15 16 18 21 23 24		1 3 4 6 8 9 12 14 17 19 20 22

Note: Your file must be set up in the same manner as the example data file and the exercise file from Part 1 with a grouping variable and a dependent/test variable. Because these are class rankings, they are ordinal data and must be identified as such in “Variable View” under the column “Measure.” Click in the cell under “Measure” in the row for your class rank variable and choose “Ordinal.” This ensures that SPSS treats the data at the proper level of measurement.

2. Create a boxplot depicting the results. (3 pts)

3. Write a current APA-style results section describing the outcome. All homework “results sections” must follow the example given in the Course Content document “Writing Results of Statistical Tests in Current APA Format” (Note: you do not have to refer to a figure). (3 pts)

Part 3: Cumulative Homework

1. An organizational psychologist wants to find out if job satisfaction ratings differ as a function of department (human resources, sales, and research and development) and/or time of shift (early, late). Choose the correct test to analyze this question, set up the SPSS file, and run the analysis. Follow the directions under the table below.

Early shift	Human Resources	Sales	Research and Development
10 16 12 16 9	19 21 16 18	17 21 18 14
Late shift	14 13 8 12 12	17 12 14 9 10	12 15 19 14

a) Paste appropriate SPSS output. (3 pts)

b) Paste appropriate SPSS graph. (3 pts)

c) Write a current APA-style results section describing the outcome. All homework “results sections” must follow the example given in the Course Content document “Writing Results of Statistical Tests in Current APA Format” (Note: you do not have to refer to a figure). (3 pts)