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Question 858:

A questionnaire about study habits was given to a random sample of students taking a large introductory statistics class. The sample of 25 students reported that they spent an average of 110 minutes per week studying statistics. Assume that the standard deviation is 40 minutes.
(a) The 95% confidence interval for the mean time spent studying statistics by students in this class is 110 minutes +/- _____ minutes

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