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A teacher wants to estimate the mean time in minutes that students take to go from one classroom to the next. His research assistant uses

A teacher wants to estimate the mean time in minutes that students take to go from one classroom to the next. His research assistant uses the sample time of 36 students to report the confidence interval as [8.20,9.80].

a. find the sample mean time to compute the confidence interval.

b. determine the confidence level of the sample standard deviation used for the interval is 2.365.

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