B6. You run a study looking at the relationships among the number of computers sold in various stores, the amount of money they spend on advertising and the size of the store. You get the following correlations from 14 stores. Advertising Advertising 1.00 Number sold 77 Size of store 26 Number sold .77 1.00 60 Size of store 26 60 1.00 If you were to predict computer sales from amount of money spent advertising and size of the store. what would R be? (4 marks) what would R be? (1 mark) .7643 .8743 c) How much more variance in sales can you account for using both variables compared to just size of the store? (2 marks) answer not shown