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A random sample of n = 121 sales invoices was taken from the very large population of such invoices, and the avergae value was found to be $47.50 with the sample standard deviation of  $7.50. Find out the 90% confidence interval for mean value of all invoices. Compare this interval with that obtained under the simplifying assumption that population standard deviation is equal to sample standard deviation.

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  • Reference No.:- M921218

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