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 y column shows the value of sales ($ thousands) last month for each client sampled. (Round the final answers to 2 decimal places.) Number of Contacts, Sales ($ thousands), Number of Contacts, Sales ($ thousands), X 43 $75 13 $24 49 108 13 25 44 74 36 150 24 31 18 81 34 32 18 20 a. Determine the 95% confidence interval, in thousands of dollars, for the mean of all sales personnel who make 54 contacts. b. Determine the 95% prediction interval, in thousands of dollars, for a particular salesperson who makes 54 contacts.