In the file Usedcars.xlsx you are given daily sales of used cars sold by four used-car salespeople. Is there evidence that the salespeople exhibit a significant difference in performance? Fill in the blank. You are 95 percent sure that the number of cars sold in a day by Salesperson 1 is between and If the first two people are men and the last two are women, is there significant evidence that the male salespeople perform differently than the female salespeople?