Psychology 241

Lab Assignment: Chi-Square

Using SPSS to Compare Proportions with Chi-Square

In this lab exercise, you will learn to use a Chi-square test in SPSS to compare two proportions. Follow the instructions below to perform the analyses, and as you do so answer the questions below. Turn in your answer sheet at the end of the lab session to receive credit for the lab.

Right-click on the link for the data file you will use in this exercise and save it to the desktop of your computer:

Data file: lab2-chi-square.sav

The data file is described by the following coding guide:

Column	Variable	Number of Digits	Possible Values	Meaning
1	Ad #	2	1-99
2	Gender	1	1, 2	1 = female, 2 = male
3	likecats	1	0, 1	1 = likes cats 0= does not like cats

Assignment for this lab session:

Open the data file, either by double-clicking it or by first starting SPSS and then opening the data file from within SPSS. Use a chi-square test to test the hypothesis that more women than men like cats. See the lecture notes on “Comparing two proportions” for detailed instructions of how to use SPSS to do this. Then answer the following questions:

Answer Sheet for Lab 2: Chi-Square name ____________________________

1. What is the independent variable in this study? ____________________________

2. What is the dependent variable? _______________________________________

3. What proportion (or percentage) of men like cats? _________

4. What proportion (or percentage) of women like cats? ________

5. How many men were there in this sample? ______________

6. How many women were there in this sample? ______________

7. What was the value of Chi-square for comparing the two proportions? ____________

8. What was the value of p associated with this value of Chi-square? ______________

9. Was the hypothesis confirmed? _____________

10. In a few sentences, report the result of this analysis as you would in the Results section of a paper: