Question

9. A manager of a grocery store would like to determine if anew method for processing customers' purchases at the cash register will enable checkout staff to process purchases more quickly, especially during high volume weekends. Nine staff were randomly selected, and the time spent for standard purchasing processes were measured(using both the old process and new process). The data is shown below (time is measured in minutes). Using an appropriate hypothesis testing method, determine if the data supports, at the 5% significance level, that the new process should, on average, enable cash register staff to more quickly complete customer purchases. a. Give the null and alternative hypotheses for this test in symbolic form b. After applying a correct hypothesis test, write a statement to give the store manager, explaining the results of the hypothesis test. Make your statement tied to the context of the problem, which asks if the new method makes a difference in the time it takes to check out.

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