A car dealer who sels onl the long-run average markup in his lot is $5,600. He takes a random sample of 16 of the new salesperson's sales and finds an average markup of $5,000 and a standard deviation of $800. Assume the markups are normally distributed. What is the value of an claim? ly late-model luxury cars recently hired a new salesperson and belleves that this salesperson is selling at lower markups. He knows that appropriote test statistic for the car dealer to use to test his Multiple Choice 15-3.00 z-3.00 5-075 2-075