(Ch8) In a large economics class, the professor announced that the scores of a recent exam were normally distributed from 51 to 87. Using the Empirical Rule on µ ± 3σ to estimate σ (that is, σ=[upper limit-lower limit]/6), how many students would you need to sample in order to construct a 90 percent confidence interval of the population mean score, with an allowable error of ±2? (Hint: use the critical value Z0.05=1.645 for a 90 percent confidence interval) a. About 25 students b. About 35 students c. About 17 students d. About 188 students

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