1 A car dealership was interested in seeing if there was a l

1. A car dealership was interested in seeing if there was a linear relationship between the number of ads shown on television and the number of cars sold. a) Using the equation for the line of best fit, calculate the predicted number of cars sold when there are 17 ads. b) In terms of your two variables, what does 0.6154 mean in the equation for the line of best fit? Make sure you answer this question like we did in class. c) Can you accurately predict the number of cars sold when there are 45 ads? Why or why not?

Solution

y= 10.28 + 0.6154(17) = 20.7418

b)

is the slope of the regression and that means that the rate of change in \"y\" that is numbers of cars sold with respect to the change in x. that is numbers of ads

c)

Yes because if we think that the relation is going to follow like this way we will have a value that satisfy the relation

and that will be

y= 10.28+ 0.6154 ( 45) = 37.973