Exhibit 8-1 in Order to Estimate the Average Time Spent on the on the Computer

question 22

Multiple Choice

Exhibit 8-1
In order to estimate the average time spent on the computer terminals per student at a local university, data were collected from a sample of 81 business students over a one-week period. Assume the population standard deviation is 1.2 hours.
-Refer to Exhibit 8-1. If the sample mean is 9 hours, then the 95% confidence interval is approximately

• A)7.04 to 110.96 hours
• B)7.36 to 10.64 hours
• C)7.80 to 10.20 hours
• D)8.74 to 9.26 hours

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