A company wants to test the effectiveness of their product advertising. It provides different marketing strategies in 10 regions. The following table contains advertising expenses (x in millions of dollars) and the number of sales (y in millions of units).

x	0	0.5	1	1.5	2	2.5	3	3.5	4	4.5
y	40	40.3	41.4	41.7	44.1	43.3	45.8	47.2	47.7	49.4

 

(a) Fit the linear regression model by least squares. Round your answer to one decimal place (e.g. 98.7). Bo Round your answer to two decimal places (e.g. 98.76). (b) Calculate R for this model. Round your answer to one decimal place (e.g. 98.7). R2 : (c) Estimate o for this model. Round your answer to two decimal places (e.g. 98.76).