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Mathematics, 08.11.2019 00:31 Winzen07
Suppose the length, in words, of the essays written for a contest are normally distributed and have a known population standard deviation of 325 words and an unknown population mean. a random sample of 25 essays is taken and gives a sample mean of 1640 words. identify the parameters needed to calculate a confidence interval at the 98% confidence level. then find the confidence interval.
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