A marketing executive is investigating whether this year’s advertising campaign has resulted in greater mean sales compared with last year’s mean sales. The executive collects a random sample of 100 customer orders from a large population of orders and calculates the sample mean and sample standard deviation. Which of the following is the appropriate test for the executive’s investigation?     A one-sample zz-test for a population mean A A one-sample tt-test for a population mean B A one-sample zz-test for a population proportion C A two-sample tt-test for a difference between means D A matched-pairs tt-test for a mean differenceE

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