These data relating the amount spent on groceries per week and the number of household members are from Example 3.3:

a. Find the best-fitting line for these data.
b. Plot the points and the best-fitting line on the same graph. Does the line summarize the information in the data points?
c. What would you estimate a household of six to spend on groceries per week? Should you use the fitted line to estimate this amount? Why or why not?

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5.75 $110.19 $118.33 $150.92 8586 $180.62