Question

Need confidence interval please

Round all intermediate calculations to at least 4 decimal places.) A marketing analyst is studying the variability in customer purchase amounts between shopping mall stores and "big box" discount stores. She suspects the variability is different between those stores due to the nature of customers involved. To investigate this issue in detail, she compiled two random samples each consisting of 26 purchase amounts at shopping mall stores and discount stores. Use Table 4 a. Select the appropriate hypotheses to test whether the variance of the purchase amounts differs between the two types of stores b. Construct the 95% confidence interval for the ratio of the population variances. Assume the purchase amount distributions are normally distributed. (Round "F value and final answers to 2 decimal places.) Confidence interval to c. Use the computed confidence interval to test whether the variance of the purchase amounts differs between the two stores at the 5% significance level The 95% confidence interval does not contain # the value 1, we reject conclude that the population variances in purchase amounts are different shopping mall stores and "big box" retail stores. Ho and between d. Confirm your conclusion using Excel's F.TEST function to calculate the p-value. (Round your answer to 4 decimal places.) The p-value is 0.0172. Thus, our conclusion agrees approach in Part c. with the confidence interval

Answer 1