Psyc 515

PSYC 515

Homework: Chi-Square SPSS Assignment Instructions

Overview

This worksheet is designed to assess your ability to perform, interpret, report, and graphically present non-parametric tests using SPSS. Non-parametric tests are used for nominal data and/or when data do not meet the assumptions required of a parametric test. Knowledge of these tests provide fundamental skills to critically evaluating and producing research in one’s field.

Instructions

Be sure you have reviewed this module’s assigned readings and presentations before completing this assignment. This includes using ensuring the homework is completed and submitted according to the instructions, SPSS output and images are legible and relevant, and that basic college level writing skills (e.g., grammar) are used in the write-ups. Answers should be placed where indicated (e.g., “ANSWER”). Note: all questions must be attempted to be eligible for full credit.

• Please note that for all problems in this course, the standard cut-off (alpha) for a test of significance will be .05, and you always report the exact power unless SPSS output states p=.000 (you’d report p<.001). Remember to check your graphs! You often have to ADD the y – axis title.

• Submit the file as a WORD document (.doc or .docx). Make sure the filename of your submission includes your full name, course and section.

• Example: SPSS5_JohnDoe_515B01

Scenario 1

In the recent COVID-19 pandemic, a local precinct observed that of the 75 people who voted, 25 identified as republican, 30 were democrat, and 20 were “other”. Is this similar to pre-pandemic voting based on political party affiliations? At that same precinct, pre-pandemic voting based on political party affiliation was: 35% republican, 44% democrats, and 21% “other”. Enter in the 75 data points and expected values into SPSS to conduct the appropriate statistical test.

1. Name the the variable of interest in the scenario. How many levels does it have, and what are they?

ANSWER

2. Calculate the expected frequencies for each of the levels of your variable. Clearly label each group and show all work involving your calculations.

ANSWER

3. Paste all relevant statistical output in the space provided below:

ANSWER

4. Present the results using APA format. This includes a full write-up to include a complete statistical notation as shown in the weekly presentations. Make sure to describe what the conclusions mean in general terms. Additional examples of APA results sections are also available in the “Helpful Hints” document.

ANSWER

Scenario 2

Is there a relationship between one’s gender and whether one owns a dog, cat, or reptile? Use the data provided in the table below to answer the following questions.

Dog Cat Reptile Row Totals

Male 20 17 11 48

Female 25 23 5 53

Column totals 45 40 16 101

5. Name the two variables of interest and the number of levels in each. Then, list the levels for each variable.

ANSWER

6. Paste all relevant statistical output in the space provided below.

ANSWER

7. Calculate the effect size. Show the formula and your calculations in the space provided below:

ANSWER

8. Using the degrees of freedom provided by your SPSS output and an alpha value of .05, find the critical value in the appropriate table in the Appendix of your Jackson e-book. Do not round – present all three decimal places. Clearly identify the critical value from your e-book and the obtained value from your SPSS output. Based on this information, would you reject or fail to reject the null hypothesis? Does this mean there is a significant difference or no significant difference?

ANSWER

9. Present the results using APA format. This includes a full write-up to include a complete statistical notation as shown in the weekly presentations. Make sure to describe what the conclusions mean in general terms. Additional examples of APA results sections are also available in the “Helpful Hints” document.

ANSWER

Scenario 3

A student researcher was surprised to learn that the 2017 NCAA Student-Athlete Substance Use Survey supported that college athletes make healthier decisions in many areas than their peers in the general student body. He collected data of his own, focusing exclusively on male student-athletes to see if such habits vary based on one’s sport. He asked 93 male student-athletes whether they had engaged in binge-drinking in the last month (> 5 drinks in a single sitting). Data are provided in the table below.

Lacrosse Hockey Swimming Row Totals

Yes – Binge 20 17 15 52

No – did not binge 16 15 10 41

Column totals 36 32 25 93

10. Name the two variables of interest. Identify all levels associated with each variable

ANSWER

11. Paste all relevant statistical output in the space provided below:

ANSWER

12. Calculate the effect size. Show the formula and your calculations in the space provided below:

ANSWER

13. Using the degrees of freedom provided by your SPSS output and an alpha value of .05, find the critical value in the appropriate table in the Appendix of your Jackson e-book. Do not round – present all three decimal places. Clearly identify the critical value from your e-book and the obtained value from your SPSS output. Based on this information, would you reject or fail to reject the null hypothesis? Does this mean there is a significant difference or no significant difference?

ANSWER

14. Present the results using APA format. This includes a full write-up to include a complete statistical notation as shown in the weekly presentations. Make sure to describe what the conclusions mean in general terms. Additional examples of APA results sections are also available in the “Helpful Hints” document.

ANSWER