Assume the population standard deviation is 1.2 hours. the, Ask an Expert

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In order to estimate the average time spent on the computer terminals per student at a local university, data were collected for a sample of 81 business students over a one week period. Assume the population standard deviation is 1.2 hours.

A) The standard error of the mean is

B) With a 0.95 probability, the margin of error is approximately

C) If the sample mean is 9 hours, then the 95% confidence interval is

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