In Exercise 33 on page 620 you found the linear regression equation  = 0.55x + 15.90, where y is the mean ideal age (in years) chosen by people whose actual age is x years.
a. Use the model to predict the mean ideal age chosen by 25-year-olds.
b. What is the slope? What does it mean in this situation?
c. What is the y-intercept? What does it mean in this situation?
d. Refer to Table 46 on page 620 to find the coefficient of determination. What does it mean in this situation?
e. What is the age of people who chose a mean ideal age equal to their actual age?