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 95​% confidence interval estimate of the standard deviation of the population from which the sample was obtained.

b. Repeat part​ (a) using the 93 professor evaluations.

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

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