Mr. James McWhinney, president of Daniel-James Financial Services, believes there is a relationship between the number of client contacts and the dollar amount of sales. To document this assertion, Mr. McWhinney gathered the following sample information. The X column indicates the number of client contacts last month, and the Ycolumn shows the value of sales ($ thousands) last month for each client sampled. (Round the final answers to 2 decimal places.) Sales Sales Number of (5 Number of (5 Contacts , thousands) , Contacts , thousands) , X Y X Y 43 $75 13 $24 49 108 13 25 44 74 36 50 24 31 18 31 34 32 18 20 a. Determine the 95% condence interval, in thousands of dollars, for the mean of all sales personnel who make 54 contacts. [E's] b. Determine the 95% prediction interval, in thousands of dollars, for a particular salesperson who makes 54 contacts. [I . I]