A study of 40 English composition professors showed that they spent, on average, 12.6 minutes correcting a student’s term paper. a) Find the 90% confidence interval of the mean time for all composition papers when σ = 2.5 minutes. b) If a professor stated that he spent, on average, 30 minutes correcting a term paper, what would be your comment?

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Confidence Intervals

When we calculate intervals in probability and statistics, it can be simply termed as finding out a confidence interval. The confidence interval is usually calculated from the data set which is observed. The value of the parameter that needs to be calculated is present here only.