A researcher uses a matched- subjects design to investigate whether single people who own pets are generally happier than single people without pets. A mood inventory questionnaire is administered to a group of 20 to 29 year old non pet owners and a similar age of pet owners. The pet owners are matched one to one with the non- pet owners doe income, number of close friendships, and general health.
a. 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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