"Exercise 18.3
The average thickness of the cortex, the outermost layer of the brain, decreases
age. The table shows the age and cortex thickness (in mm) from a sample of 9
random subjects:
a) Calculate the least-squares regression equation.
b) Calculate the Coefficient of Determination.
c) Test using an ANOVA whether the linear relationship is significant (use
a significance level of 0.05).
d) What is the thickness when the age is 77?
