Suppose we conduct a regression with RGDP as the dependent variable and TREND, UR, CPI and M1 as the explanatory variables. We wish to test this model for heteroscedasticity. Use the White's test and the modified White's test at the 0.10 level to determine whether heteroscedasticity exists. If heteroscedasticity exists, what variables might be causing it based on your regression results? You do not need to try and correct for heteroscedasticity in this problem.

Data Set: https://docs.google.com/spreadsheets/d/1xe_TsJFrsEF02zarWa3pks8UfZLs1bM81YMrNLAU5zw/edit?usp=sharing