The Regression Line and the Limits of Its Prediction

A Reta de Regressão e os Limites da Sua Previsão

For eight pairs of data with x between 1 and 9, the summary values are \bar{x} = 5, \bar{y} = 32, S_{xy} = 84 and S_{xx} = 42. Find the equation of the regression line of y on x, predict y when x = 7, and comment on a prediction at x = 20.