Stats teachers cars A random sample of AP Statistics

Chapter , Problem R3.4

(choose chapter or problem)

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 its residual. (c) Interpret the slope of the line in context. (d) Whats the correlation between car age and mileage? Interpret this value in context. (e) How well does the regression line fit the data? Justify your answer using the residual plot and s. s Make a scatterplot to display the relationship between two quantitative variables. s Use your calculator to find a least- squares regression line and make a residual plot. s Calculate residuals and interpret residual plots. s Explain what r 2 and s tell you about how well a regression line fits a set of data.