Mathematics, 05.12.2019 19:31, litzy9506

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 40 repair costs and find the mean to be $100.00. from past studies, you assume that the standard deviation σ is $17.50.

construct a 90% confidence interval and interpret it.

construct a 95% confidence interval and interpret it.

construct a 99% confidence interval and interpret it.

determine the minimum required sample size if you want to be 95% confident that the sample mean is within $10 of the population mean.

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You work for a consumer advocate agency and want to find the mean repair cost of a washing machine....