Consider the following two scatterplots based on data gathered in a study of 30 crickets, with temperature measured in degrees Fahrenheit and chirp frequency measured in chirps per minute.
a. If the goal is to predict temperature based on a cricket€™s chirps per minute, which is the appropriate scatterplot to examine€”the one on the left or the one on the right? Explain briefly.
One of the following is the correct equation of the least squares line for predicting temperature from chirps per minute:

A. predicted temperature = 35.78 + 0.25 chirps per minute
B. predicted temperature = ˆ’131.23 + 3.81 chirps per minute
C. predicted temperature = 83.54 ˆ’ 0.25 chirps per minute
b. Which is the correct equation? Circle your answer and explain briefly.
c. Use the correct equation to predict the temperature when the cricket is chirping at 100 chirps per minute.
d. Interpret the value of the slope coefficient, in this context, for whichever equation you think is the correct one.

Transcribed Image Text:

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