Question: What sample sizes should be used for these time studies? a. There should be a .90 probability that the value of the sample mean is

What sample sizes should be used for these time studies?

a. There should be a .90 probability that the value of the sample mean is within 2 minutes, given that the standard deviation is 4 minutes.

b. There should be a 95 percent chance that the sample mean has an error of 0.10 minutes or less when the variance is estimated as 0.50 minutes.

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