Mathematics, 05.05.2020 05:24 LukeneedhelpInMath
A National Retail Foundation survey found households intended to spend an average of $649 during the December holiday season. The survey included 600 households and the sample standard deviation was $175. The 95% confidence interval for the mean amount spent during the December holiday season is {635, 663} The prior year, the population mean expenditure per household was $632. Does your confidence interval provide evidence that the average has changed?
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