Sample Size. In Exercises 29–36, find the sample size required to estimate the population mean. Mean Grade-Point Average Assume that all grade-point averages are to be standardized on a scale between 0 and 4. How many grade-point averages must be obtained so that the sample mean is within 0.01 of the population mean? Assume that a 95% confidence level is desired. If we use the range rule of thumb, we can estimate σ to be range/4 = (4 − 0)/4 = 1. Does the sample size seem practical?

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