Campaign Increase in cost, x sales, y (percent) ху (in millions of dollars) y 4.05 6.97 28.2285 7.2+ 1.34 6.39 8.5626 7+ 1.69 6.19 10.4611 6.8+ 2.30 6.63 15.249 6.6+ 3.96 6.78 26.8488 6.4+ 2.10 6.39...

What is the slope of the least-squares regression line for these data? Carry your intermediate computations to at least four decimal places and round your answer to at least two decimal places.

Extracted text: Campaign Increase in cost, x sales, y (percent) ху (in millions of dollars) y 4.05 6.97 28.2285 7.2+ 1.34 6.39 8.5626 7+ 1.69 6.19 10.4611 6.8+ 2.30 6.63 15.249 6.6+ 3.96 6.78 26.8488 6.4+ 2.10 6.39 13.419 6.2+ 1.94 6.77 13.1338 6. 3.09 6.94 21.4446 1.5 2.5 3 4 1.72 6.60 11.352 Campaign cost (in millions of dollars) 3.12 6.59 20.5608 2.85 6.65 18.9525 Figure 1 3.77 6.86 25.8622 Increase in sales (percent)


Extracted text: An advertising firm wishes to demonstrate to its clients the effectiveness of the advertising campaigns it has conducted. The following bivariate data on twelve recent campaigns, including the cost of each campaign (denoted by x, in millions of dollars) and the resulting percentage increase in sales (denoted by y) following the campaign, were presented by the firm. A scatter plot of the data is shown in Figure 1. Also given is the product of the campaign cost and the percentage increase in sales for each of the twelve campaigns. (These products, written in the column labelled "xy", may aid in calculations.)