Copier sales of America sell copiers to businesses of all sizes throughOut the United States and Canada. Ms. Mercy Bancer was recently promoted to the position of national sales manager. At the upcoming sales meeting, the sales representatives from all over country will be in attendance. She would like to impress upon them the importance of making that extra sales call each day. She decides to gather some information on the relationship between the number of sales calls and the number of copiers sold. She selects a random sample of 10 sales representatives and determines the number of sales call they made last month and the number of copiers they sold. The sample information is reported in the Table. Sales Representative Number of Sales Calls Number of copiers Sold Tom 2 3 Jeff 4 6 Brian 2 4 Greg 3 6 Susa n 1 3 Carlos 1 4 Rich 20 40 Mike 20 50 Mark 20 3O Soni 3D 70 a. Plot a scatter diagram to show the relationship between sales calls and copiers sold. Use the least squares method to determine a linear equation to express the relationship between the two variables. [follow table 14.2, page 628 example} c. Using the answer for (b) above, what is the expected number of copiers sold by a representative who made 20 calls? d. Calculate the coefficient of determination {R2} for the relationship between numbers of copiers sold and the number of sales calls made. e. Determine a 95 percent confidence interval for Sheila, a west Coast sales representative who made 25 calls