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 0.008of the population​ mean? Assume that a 98​%confidence level is desired. If using the range rule of​ thumb, σcan be estimated as range/ 4 = 4-0/ 4 = 1 Does the sample size seem​ practical? The required sample size is ?

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