A car dealer who sells only late-model luxury cars recently hired a new salesperson and believes that this salesperson isselling at lower markups, He knows that the long-run average markup in his lot...

Extracted text: A car dealer who sells only late-model luxury cars recently hired a new salesperson and believes that this salesperson isselling at lower markups, He knows that the long-run average markup in his lot is $5,600. He takes a random sample of 16of the new salesperson's sales and finds an average markup of $5,000 and a standard deviation of $800. Assume themarkups are normally distributed. What is the value of an appropriate test statistic for the car dealer to use to test his claim? A. t15 = -3.00 B. z -3.00 C. tis = -0.75 D. z -0.75 5,