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1. A marketing manager conducted a study to determine whether there is a linear relationship between money spent on advertising and company sales. The data are listed in the following table. Advertising expenses (1000s of S), 2.4 1.6 2.0 2.6 1.4 1.6 2.0 2.2 Company sales (1000s of $), y225 184 220 240 180 184 186 215 Some sumnnary statistics are as follows: x = 15.8, y = 1634, zy = 3289.8, and z2-32.44. (a) What is the correlation coefficient between these two variables? (b) Write down the least squares regression equation c) What is the coefficient of determination of your regression? (d) At = 0.01, is there a significant linear relationship between these two variables? (e) Suppose a company plans to spend $1,800 on advertisement, what is the expected sales