Sample Size . In Exercises 29–36, find the sample size required to estimate the population mean . 31. 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?
Sample Size . In Exercises 29–36, find the sample size required to estimate the population mean . 31. 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?
Sample Size. In Exercises 29–36, find the sample size required to estimate the population mean.
31. 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?
Definition Definition Number of subjects or observations included in a study. A large sample size typically provides more reliable results and better representation of the population. As sample size and width of confidence interval are inversely related, if the sample size is increased, the width of the confidence interval decreases.
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