A researcher investigates whether single people who own pets are generally happier than single people without pets. A group of non-pet owners is compared to pet owners using a mood inventory. The pet owners are matched one to one with the non-pet owners for income, number of close friendships, and general health. A. Single-sample z-test B. Single-sample t-test C. Independent samples t-test D. Related samples t-test (repeated measures or matched samples) E. Correlation

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