Home / Questions / Mr James McWhinney president of Daniel-James Financial Services believes there is a relati...
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 your answers to 3 decimal places.)
Number of Contacts, Sales ($ thousands), Y Number of Contacts, X Sales ($ thousands),
X Y X Y
14 24 23 30
12 14 48 90
20 28 50 85
16 30 55 120
46 80 50 110
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.
[_________ , _________ ]
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