5. A researcher uses a matched samples design to investigate whether people who own pets are generally happier than people without pets. A mood 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 15 9 10 19 17 15 A B C D E F 10 9 11 11 5 9 Is there a significant difference in the mood scores for non-pet owners versus pet owners? Test with a = .05 for two tails.

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