Some people like cats and some like dogs. Cats are generally thought of as more independent and aloof. A personality psychologist wondered if a relationship existed between the personality trait of introversion/ extroversion and the type of pet a person preferred. He obtained a sample of cat owners and a sample of dog owners. Each pet owner took a personality test and was classified as an introvert or an extrovert. What statistical test should be used to see if the two variables are related?

Select the appropriate statistical technique from among those in Figure 16.7.

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Selecting a relationship test Level of measurement of the variables One ordinal and one One nominal and one Both interval/ratio Both nominal ordinal/interval/ratio ordinal/interval/ratio Use difference test flowchart. Number of Chi-square test of independence Pearson r Spearman r groups is determined by number of levels of nominal variable