C13.6 Use CRIME3.RAW for this exercise. (i) In the model of Example 13.6, test the hypothesis H0: 1
2. (Hint: Define 1
1  2 and write 1 in terms of 1 and 2. Substitute this into the equation and then rearrange. Do a t test on 1.) (ii) If 1
2, show that the differenced equation can be written as log(crimei )
0  1 avgclri  ui , where 1
21 and avgclri
(clrprci,1  clrprci,2)/2 is the average clear-up percentage over the previous two years. (iii) Estimate the equation from part (ii). Compare the adjusted R-squared with that in (13.22). Which model would you finally use?