Question: Jim and Bob recently time-studied a janitorial task. From a sample of 75 observations, they computed an average cycle time of 15 minutes with a

Jim and Bob recently time-studied a janitorial task. From a sample of 75 observations, they computed an average cycle time of 15 minutes with a standard deviation of 2 minutes. Was their sample large enough that one can be 99% confident that the standard time is within 5% of the true value?

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