### Determine the 90 percent confidence intervals

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##### Reference no: EM131123437

Suppose that the standard deviation of the tube life for a particular brand of TV picture tube is known to be s = 500, but that the mean operating life is not known. Overall, the operating life of the tubes is assumed to be approximately normally distributed. For a sample of n = 15, the mean operating life is X = 8,900 hr. Determine (a) the 95 percent and (b) the 90 percent confidence intervals for estimating the population mean.

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