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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