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7. To estimate the average annual expenses of students on books and class materials a sample of size 36 is taken. The sample mean is

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7. To estimate the average annual expenses of students on books and class materials a sample of size 36 is taken. The sample mean is $850 and the sample standard deviation is $54. A 99% condence interval for the population mean is A. $823.72 to $876.28 B. $832.36 to $867.64 C. $826.82 to $873.18 D. $825.49 to $874.51

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