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Question
We want to estimate with 99 percent confidence the percentage of automobile purchasers who are under 30 years of age. A margin of error of 5 percentage points is desired. What sample size is needed? In an earlier sample, we found a 99 percent confidence interval of purchasers under 30 years of age to be [.18, .27].A. 104
B. 664
C. 392
D. 523
Answer
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