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29. A study of 40 English composition professors showed that they spent, on average, 12.6 minutes...

29. A study of 40 English composition professors showed that they spent, on average, 12.6 minutes correcting a student’s term paper. The standard deviation was 2.6 min. a.Find and interpret the 90% confidence interval for the mean grading time of all composition papers. b. Does the confidence interval, at 90% confidence level, provide sufficient evidence that the mean time English composition professors spend on grading term papers exceeds 11 minutes? Write an appropriate inequality to justify your answer

Math   Statistics-And-Probability   
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