Question: Predicting gas usage In Example 4.7 (page 170), we examined the relationship between the average monthly temperature and the amount of natural gas consumed in

Predicting gas usage In Example 4.7 (page 170), we examined the relationship between the average monthly temperature and the amount of natural gas consumed in Joan’s midwestern home. Th e equation of the least-squares line shown in Figure 4.18 is y 5 1425 2 19.87x.

(a) Identify the slope of the line and explain what it means in this setting.

(b) Identify the y intercept of the line and explain what it means in this setting.

(c) Use the regression line to predict the amount of natural gas Joan will use in a month with an average temperature of 30F.

=4.28 Pizza party regression

(a) Use the graph and some algebra to show that the equation of the least-squares line is y 5 10 2 12/32x.

(b) What’s the slope of the line? Explain what this value means in this setting.

(c) What’s the y intercept? Explain what this value means in this setting.

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