Consumer Reportsuses a survey of readers to obtain customer satisfaction ratings for the nation's largest supermarkets (Consumer Reportswebsite). Each survey respondent is asked to rate a specified supermarket based on a variety of factors such as quality of products, selection, value, checkout efficiency, service, and store layout. An overall satisfaction score summarizes the rating for each respondent withmeaning the respondent is completely satisfied in terms of all factors. Sample data representative of independent samples of Publix and Trader Joe's customers are shown below.

Excel File:data10-07.xlsx

PublixTrader Joe'sa.Formulate the null and alternative hypotheses to test whether there is a difference between the population mean customer satisfaction scores for the two retailers.

- Select your answer -

greater than 0

greater than or equal to 0

less than 0

less than or equal to 0

equal to 0

not equal to 0

Item 1

- Select your answer -

greater than 0

greater than or equal to 0

less than 0

less than or equal to 0

equal to 0

not equal to 0

Item 2

b.Assume that experience with theConsumer Reportssatisfaction rating scale indicates that a population standard deviation ofis a reasonable assumption for both retailers. Conduct the hypothesis test and report the-value.

-value =(todecimals)

At alevel of significance what is your conclusion?

1. Reject. There is not sufficient evidence to conclude that the mean satisfaction scores differ for the two retailers.
2. Do not reject. There is not sufficient evidence to conclude that the mean satisfaction scores differ for the two retailers.
3. Reject. There is sufficient evidence to conclude that the mean satisfaction scores differ for the two retailers.
4. Do not reject. There is sufficient evidence to conclude that the mean satisfaction scores differ for the two retailers.

- Select your answer -

I

II

III

IV

Item 4

c.Which retailer, if either, appears to have the greater customer satisfaction?

- Select your answer -

Publix

Trader Joe's

Cannot be determined

Item 5

Provide aconfidence interval for the difference between the population mean customer satisfaction scores for the two retailers. Enter negative values as negative numbers, if any.

to(todecimals)