Sampling at the mall. A market researcher chooses at random from women entering a large suburban shopping mall. One outcome of the study is a 95% confidence interval for the mean of "the highest price you would pay for a pair of jeans."
(a) Explain why this confidence interval does not give useful information about the population of all women.
(b) Explain why it may give useful information about the population of women who shop at large suburban malls.