Researchers at a car resale company are trying to build a model to predict a car's 4-year resale value (in thousands of dollars)from several predictor variables.The variables they selected are as below.
Data were collected on cars of different models made by different manufacturers.SPSS output for the least-squares regression model is given below.
A Normal quantile plot of the residuals is given below.
What assumption do we check with this graph,and does the assumption seem to be satisfied?