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A social psychologist is studying whether people are more likely to help a poor person or a rich person who they find lying on the floor. The three conditions all involve an elderly woman who falls down in a shopping mall ( when only one person at the time is near by). The independent variable concerns the apparent wealth of the woman; she is dressed to appear either poor, wealthy, or middle class, The reaction of each bystander is classified in one of the three ways: ignoring her, asking her if she is alright, and helping her to her feet. The data appear in the contingency table below:
Poor Middle Class Wealthy
Ignores 16 10 7
Talks to her 8 6 5
Helps her up 6 14 18
a. Test null hypothesis at .01 level? Is there evidence for an association between the apparent wealth of the victim and the amount of help provided by a bystander?
b. Calculate Cramer's phi for these data. What can you say about the strength of the relationship between the two variables?
Explain your answer to someone who is familiar with the t test for a single sample, but not with the t test for independent means.
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