Question: A consumer agency tested 290 hams, finding that 64 were underweight. (a) Construct a 95 percent confidence interval for the true percent of underweight hams. (b) If the goal is to reduce the incidence of underweight hams to 25 percent or less, does this sample show that the goal is being achieved? (c) Explain how this confidence interval is equivalent to a two-tailed test at a = .05. (Data are from Detroit Free Press, March 9, 1999. p. 2A.)

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