3.6. Rachel collects police data on a series of burglaries and wishes to determine the factors that influence the amount of property stolen in each case. She creates a multiple regression model and runs a test of tolerance for each of the independent variables. Her results are as follows, where y ¼ Amount of property stolen ($):

INDEPENDENT VARIABLE SCALE TOLERANCE x: Time of robbery (AM or PM) Nominal 0.98 X Accessibility of property Ordinal 0.94 X3: Number of rooms in house Ratio 0.12 X4: Size of house Ratio 0.12 X: Joint income of family Ratio 0.46

Would you advise Rachel to make any changes to her model? Explain your answer.