3.20 Chirping Crickets Male crickets chirp by rubbing their front wings together, and their chirping is temperature dependent. Crickets chirp faster with increasing temperature and slower with decreasing temperature. The table below shows the number of chirps per second for a cricket, recorded at 10 different temperatures.

a. Which of the two variables (temperature and number of chirps) is the independent variable, and which is the dependent variable?

b. Plot the data using a scatterplot. How would you describe the relationship between temperature and number of chirps?

c. Find the least-squares line relating the number of chirps to the temperature.

d. If a cricket is monitored at a temperature of 26C, what would you predict his number of chirps would be?

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Chirps per second 20 16 19 18 18 16 14 17 15 16 Temperature (C) 31 23 33 30 28 24 20 27 21 29