The manager of a bookstore wants to predict Sales from Number of Sales People Working using the accompanying data. Complete parts a through h below. Part 1 a) Find the slope estimate, . enter your response here (Round to three decimal places as needed.) Number_of_Sales_People_Working Sales_(in_$1000) 2 10 4 12 5 13 9 16 10 17 10 19 13 19 16 22 18 22 21 25.