An entrepreneur owns and operates a medium sized company that sells sunglasses and beachwear to retailers. He is interest in analyzing the effect of several variables on the weekly sales for his business. He has collected data for a sample of 20 weeks. Use the accompanying data set to complete parts a through c. Click the icon for the data on company performance. a. Produce a regression equation that will predict the sales as a function of the other four variables. Lety be Sales (in thousands of dollars), X, be Average Weekly High Temperature, xz be Advertising Spending (in thousands of dollars), xg be Number of Website Hits, and xbe Number of Orders Placed. 9=0+ x + ( x2+x+ x4 (Round the constant to the nearest integer as needed. Round all other values to two decimal places as needed. Do not include the $ symbol in your answer.)