Suppose It Is Desired to Estimate the Average Time a Customer

question 95

Multiple Choice

Suppose it is desired to estimate the average time a customer spends in a particular store to withir 5 minutes (e.g., $\pm 5$ minutes) at $99 \%$ reliability. It is estimated that the standard deviation of the times is 15 minutes. How large a sample should be taken to get the desired interval?

• A) \(n = 35\)
• B) \(n = 25\)
• C) \(\mathrm { n } = 60\)
• D) \(\mathrm { n } = 299\)

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