A researcher uses a matched-samples design to investigate whether single people who own pets are generally happier than singles without pets. A mood inventory questionnaire is administered to a group of 20- to 29-year-old non-pet owners and a similar age group of pet owners. The pet owners are matched one to one with the non-pet owners for income, number of close friendships, and general health. The data are as follows: Matched pair Non-pet Owner Pet owner A 10 15 B 9 9 C 11 10 D 11 19 E 5 17 F 9 15 1. Is there a significant difference in the mood scores for non-pet owners versus pet owners? 2.What is the appropriate statistical tool? 3. t-value? 4. p-value? 5. Interpret the results.

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