Stats teachers’ cars A random sample of AP® Statistics teachers was asked to report the age (in years) and mileage of their primary vehicles. A scatterplot of the data, a least-squares regression printout, and a residual plot are provided below.
(a) Give the equation of the least-squares regression line for these data. Identify any variables you use.
(b) One teacher reported that her 6-year-old car had 65,000 miles on it. Find and interpret its residual.
(c) What’s the correlation between car age and mileage? Interpret this value in context.
(d) Is a linear model appropriate for these data? Explain how you know.
(e) Interpret the values of s and r 2.
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