Sales data were collected from a small bookstore. The following is an equation for the regression line of the data. Sales = 7.83 + 0.949 Number of Salespeople Working The assumptions and conditions for regression are met, and from technology, it is known that SE (b, ) = 0.0883 and S. = 1.474. Complete parts a through c below. Click the icon to view the data table. a) Find the predicted Sales on a day with 12 employees working. The predicted Sales on a day with 12 employees working is thousand dollars. -X (Round to two decimal places as needed.) Data table b) Find the 95% confidence interval for the mean Sales on days with 12 employees working. Number of Salespeople Working Sales (in $1000's) The interval in thousands is (]]). 10 (Round to two decimal places as needed.) 10 14 c) Find the 95% prediction interval for Sales on a day with 12 employees working. 10 15 The interval in thousands is (]]). 11 19 8 17 (Round to two decimal places as needed.) 14 20 16 24 17 25 17 23 x =10.4 y = 17.7 SD(x) = 5.56 SD(y) = 5.46 Print Done