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Question : Which of the following involve independent samples? a. To test : 84351

Which of the following involve independent samples? a. To test the effectiveness of the Atkins diet, 36 randomly selected subjects are weighed before the diet, and then 6 months after the diet ends. The two samples consist of before/after weights. b. To determine whether smoking affects memory, 50 randomly selected smokers are given a test of word recall and 50 randomly selected non-smokers are given the same test. Sample data consists of the scores from the two groups. c. IQ scores are obtained from a random sample of 75 wives, IQ scores are also obtained from their husbands. d. Annual incomes are obtained from a random sample of 1200 residents of Alaska and from another random sample of 1200 residents of Hawaii. e. Scores from a standard test of mathematical reasoning are obtained from a random sample of statistics students and another random sample of sociology students.

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