Mr James McWhinney president of DanielJames Financial Servic

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.)

Determine the 98% confidence interval, in thousands of dollars, for the mean of all sales personnel who make 56 contacts.

Determine the 98% prediction interval, in thousands of dollars, for a particular salesperson who makes 56 contacts.

Solution