Create 90 percent of the mean confidence interval

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You work for a consumer advocate agency and want to find the mean repair cost of a washing machine. As part of your study, you randomly select 45 repair costs and find the mean to be $115. The sample standard deviation is $16.40.

a. construct 90% of the mean confidence interval for the population of mean repair cost

b.the 90% interval confidence is _____ , ______ (Round to two decimal places as needed).

Reference no: EM13111257

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