Take another look at the regression analysis of tar and nicotine content of the cigarettes in Exercise 43.

Dependent variable is Nicotine
R-squared = 92.4%
Variable Coefficient
Constant ………… 0.154030
Tar ………………. 0.065052
a) Write the equation of the regression line.
b) Estimate the Nicotine content of cigarettes with 4 milligrams of Tar.
c) Interpret the meaning of the slope of the regression line in this context.
d) What does the y-intercept mean?
e) If a new brand of cigarette contains 7 milligrams of tar and a nicotine level whose residual is -0.5 mg, what is the nicotine content?