Refer to Exercise 16.

Data From Exercise 16:

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.

a. Determine the 95% confidence interval, in thousands of dollars, for the mean of all sales personnel who make 40 contacts.

b. Determine the 95% prediction interval, in thousands of dollars, for a particular salesperson who makes 40 contacts.

Transcribed Image Text:

Number of Sales Number of Sales Contacts, ($ thousands), Contacts, ($ thousands), y y 14 24 23 30 12 14 48 90 20 28 50 85 16 30 55 120 46 80 50 110