For Exercises use the same data as for the corresponding exercises in Section 101. For each exercise,

Question:

For Exercises use the same data as for the corresponding exercises in Section 10–1. For each exercise, find the equation of the regression line and find the y value for the specified x value. Remember that no regression should be done when r is not significant.

The annual energy consumption in billions of Btu for both natural gas and coal is shown for a random selection of states.

Find the amount of coal used when 500 Btu of natural gas is used.

The annual energy consumption in billions of Btu for both natural gas and coal is shown for a random selection of states. Is there a linear relationship between the variables?