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

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