A researcher recorded the rate at which a cricket chirps for various temperatures. A random selection of the data is shown in Table 13.

Let R be the chirp rate (number of chirps per 13 seconds) when the temperature is F degrees Fahrenheit.
a. Identify the explanatory and response variables.
b. Construct a scatterplot by hand.
c. Is the association positive, negative, or neither? What does that mean in this situation?
d. Graph the model R = 1.02F - 38.03 by hand on the scatterplot. Does the line come close to the data points?
e. Use the model to predict the chirp rate when the temperature is 70°F.

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Table 13 Temperatures versus Chirp Rates Temperature (eF) 57 73 Chirp Rate (number of chirps per 13 seconds) 18 36 81 51 59 13 24 29