In Exercise 3.18, we found that male crickets chirp by rubbing their front wings together, and their chirping is temperature dependent. The table below shows the number of chirps per second for a cricket, recorded at 10 different temperatures:

a. Use the formulas given in this chapter to find the least-squares regression line relating the number of chirps to temperature. Compare to the results obtained in Exercise 3.18.
b. Do the data provide sufficient evidence to indicate that there is a linear relationship between number of chirps and temperature?
c. Calculate r2. What does this value tell you about the effectiveness of the linear regression analysis?

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Chirps per Second | 20 16 19 18 18 16 14 17 15 16 Temperature 88 73 91 85 82 75 69 82 69 83