It Is Desired to Estimate the Average Time It Takes $n = 189$

question 14

Multiple Choice

It is desired to estimate the average time it takes Statistics students to finish a computer project to within two hours at 90% reliability. It is estimated that the standard deviation of the times is 14 hours. How large a sample should be taken to get the desired interval?

• A) \(n = 189\)
• B) \(n = 231\)
• C) \(\mathrm { n } = 325\)
• D) \(n = 133\)

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