Question: A regression equation that describes the relationship between the amount of the bill ($) at a restaurant and the tip ($) that was left is:

Tip = 2.9 + 0.1 Bill

a. For every increase in the bill by 1 dollar, how much additional tip should a server expect to receive? Does this suggest that customers, on the average are tipping at least 15%? Disregard the y-intercept in this analysis as it has no logical interpretation (we would not have any data with amount of bill = $0)

b. Use the regression plot found below (Figure A.7) to estimate (predict) the amount of tip that a server should expect when the restaurant bill is $60. Do not use the equation.

c. The correlation between these two variables is .586 and has a p-value of .127. What conclusion can be made about the relationship between the amount of the bill and the tip that was left?