7B.1
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) A one-sample z-test for a population mean

B) A one-sample t-test for a population mean

C) A one-sample z-test for a population proportion

D) A two-sample t-test for a difference between means

E) A matched-pairs t-test for a mean difference