Mathematics, 15.07.2020 03:01 falmujaahid026
A survey collected data on annual credit card charges in seven different categories of expenditures: transportation, groceries, dining out, household expenses, home furnishings, apparel, and entertainment. Using data from a sample of 42 credit card accounts, assume that each account was used to identify the annual credit card charges for groceries (population 1) and the annual credit card charges for dining out (population 2). Using the difference data, with population 1 − population 2, the sample mean difference was d = $840, and the sample standard deviation was sd = $1,123.
A. Formulate the null abd alternative hypothesis to test for no difference between the population mean credit card charges for groceries and the population mean credit card charges for dining out.
B. Use a .05 level of significance. Can you can conclude that the population mean differ? What is the p-value?
C. Which category, groceries or dining out, has a higher population mean annual credit card charge? What is the point estimate of the difference between the population means? What is the 95% confidence interval estimate of the difference between the population means?
Answers: 2
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A survey collected data on annual credit card charges in seven different categories of expenditures:...
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