The Lifetime Of Inexpensive Wristwatches Of A Sample Of 25 Watches Has A Standar

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the lifetime of inexpensive wristwatches of a sample of 25 watches has a standard deviation of 4.8 months. assume the variance is normally distributed. use the chi-square distribution table to find any chi-square values to three decimal places.round your final answers to one decimal place

find the 90% confidence interval for the variance and standard deviation

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