Listed in the accompanying data table are student evaluation ratings of courses and professors, where a rating of 5 is for "excellent." Assume that each sample is a simple random sample obtained from a population with a normal distribution.a. Use the

93

course evaluations to construct a

99%

confidence interval estimate of the standard deviation of the population from which the sample was obtained.b. Repeat part (a) using the

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professor evaluations.c. Compare the results from part (a) and part (b).