Question

a) In a study of consumer habits, researchers designed a questionnaire to identify compulsive buyers. For a sample of consumers who identified themselves as compulsive buyers, questionnaire scores have a mean of 0.83 and a standard deviation of 0.24. Assume that the subjects were randomly selected and that the sample size was 32. At the 0.01 level of significance, test the claim that the self-identified compulsive-buyer population has a mean greater than 0.21. b) A New York Times article noted that the mean lifespan for 35 male symphony conductors was 73.4 years, in contrast to the mean of 69.5 years for males in the general population. Assuming that the 35 males have lifespans with a standard deviation of 8.7 years, use a 0.05 significance level to test the claim that male symphony conductors have a mean lifespan that is different.

          a) In a study of consumer habits, researchers designed a questionnaire to identify compulsive buyers. For a sample of consumers who identified themselves as compulsive buyers, questionnaire scores have a mean of 0.83 and a standard deviation of 0.24. Assume that the subjects were randomly selected and that the sample size was 32. At the 0.01 level of significance, test the claim that the self-identified compulsive-buyer population has a mean greater than 0.21.

b) A New York Times article noted that the mean lifespan for 35 male symphony conductors was 73.4 years, in contrast to the mean of 69.5 years for males in the general population. Assuming that the 35 males have lifespans with a standard deviation of 8.7 years, use a 0.05 significance level to test the claim that male symphony conductors have a mean lifespan that is different.

Added by Lisa B.

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