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tried solving this question but could not find the answer Construct 90% confidence interval for the difference in mean number of years between accidents in

tried solving this question but could not find the answer

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Construct 90% confidence interval for the difference in mean number of years between accidents in western and eastern cities. Let u, denote the mean number of years between accidents in western cities. Use tables to find the critical value and round the answers to at least two decimal places. 90% confidence interval for the difference in mean number of years between accidents in western and eastern cities is

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