Use the data in Exercise 3 for the following.
a. Compute a point estimate for the mean volume for trees with a diameter of 44 centimeters.
b. Construct a 95 % confidence interval for the mean volume of trees with a diameter of 44 centimeters.
c. Predict the volume for a particular tree whose diameter is 44 centimeters.
d. Construct a 95 % prediction interval for the volume of particular tree whose diameter is 44 centimeters.