Use the data in Exercise 7 for the following.
a. Compute a point estimate for the mean energy use for families with an income of $50,000.
b. Construct a 95% confidence interval for the mean energy use for families with an income of $50,000.
c. Predict the energy use for a particular family with an income of $50,000.
d. Construct a 95% prediction interval for the energy use for a particular family with an income of $50,000. 9. Interpret calculator display: