Find a 99% confidence interval for the population mean for a sample of size 36 that yields a mean of 78 and a standard deviation of 6....

Asked Apr 08 '14 at 02:27

Active Apr 08 '14 at 02:27

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Find a 99% confidence interval for the population mean for a sample of size 36 that yields a mean of 78 and a standard deviation of 6. Assume sigma, the population standard deviation, is unknown.

A) (74.2, 81.8) B) (76.00, 80.03) C) (75.28, 80.72) D) None of the above

asked Apr 08 '14 at 02:27

user141507

What have you tried? You are intended (though it is not stated) to assume a normal distribution. You should have a formula for the variance of the mean of a sample. – Ross Millikan Apr 08 '14 at 02:31
No.${}{}{}{}{}$ – Apr 08 '14 at 02:33

Find a 99% confidence interval for the population mean for a sample of size 36 that yields a mean of 78 and a standard deviation of 6....

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