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A Professor Wants to Use the Mean of a Random σ=29\sigma=29

Question 12

Multiple Choice

A professor wants to use the mean of a random sample to estimate the average amount of time students take to do their homework. He wants to be able to assert with a probability of 0.99 that his error will be at most 15 minutes. If σ=29\sigma=29 minutes, how large a sample will he need?


A) 15
B) 14
C) 25
D) 4

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