The sales director for The University Bookstore wants to know if a sales campaign wit really boost sales of School clothing items. She randomly selected 13 campuses where the bookstore does business and measured the weekly sales volume for those stores before and after the sales campaign. The collected sample sales results from the stor are shown in the Homework #3a Data spreadsheet - Sales worksheet. At the 05 leve of significance can the sales director conclude that there is evidence that the sales lane marketing campaign worked to increase school clothing sales?