How manygrade-point averages must be obtained so that the sample mean is within 0.013

0.013 of the populationmean? Assume that a 95

95% confidence level is desired. If using the range rule ofthumb, sigma

can be estimated as StartFraction range Over 4 EndFraction

range4equals

=StartFraction 4 minus 0 Over 4 EndFraction

404equals

=1

1. Does the sample size seempractical?

-._.- Assume that all gradepoint averages are to be standardized on a sale behueen El and 4. How many gradepoint averages must be obtained so that the ample mean range 4 - l] 4 4 is within 0.013 of the population mean? Assume that a 95% condence level is desired. If using the range rule of thumb, o Iln be estimated as Does the sample size seem practical? The required sample size is (Round up to the nearest whole number as needed.)