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7. Newsweek performed a poll in which 567 American parents were asked the question, "Would you prefer to have your child taught by a male or female for grades K-2?" Only 12% responded that they would prefer to have their child taugh by a male in grades K-2. Construct a 99% confidence interval for the poll. 8. A nutrition store in the mall is selling "Memory Booster," which is a concoction of herbs and minerals that is intended to improve memory performance, but there is no good reason to think it couldn't possibly do the opposite. To test the effectiveness of the herbal mix, a researcher obtains a sample of 8 participants and asks each person to take the suggested dosage each day for 4 weeks. At the end of the 4-week period, each individual takes a standardized memory test. In the general population, the standardized test is known to have a mean of u = 7. (Set the significance level=>a = .05) |