Chapter 3: Q.2.2 (page 149)

What form does the relationship take? Why are there two clusters of points?
Short Answer
There is a linear relationship between the two variables.
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Chapter 3: Q.2.2 (page 149)

What form does the relationship take? Why are there two clusters of points?
There is a linear relationship between the two variables.
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How much gas? Refer to Exercise . Would it be appropriate to use the regression line to predict Joan’s natural-gas consumption in a future month with an average temperature of °F? Justify your answer
Marijuana and traffic accidents (1.1) Researchers in New Zealand interviewed drivers at age
They had data on traffic accidents and they asked the drivers about marijuana use. Here are data on the numbers of accidents caused by these drivers at age , broken down by marijuana use at the same age

(a) Make a graph that displays the accident rate for each class. Is there evidence of an association
between marijuana use and traffic accidents?
(b) Explain why we can’t conclude that marijuana use causes accidents.
Should you use this line to predict the rat’s weight at age years? Use the equation to make the prediction and think about the reasonableness of the result. (There aregrams in a pound.)
57. Bird colonies Refer to Exercises and . For the regression you performed earlier, and . Explain what each of these values means in this setting.
Oil and residuals Refer to Exercise . The following figure shows a residual plot for the least-squares regression line. Discuss what the residual plot tells

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