Price 10,000 15,000 5,000 J 1. This is the scatterplot between the price of cars and the size of the turn circle that they can make. This seems quite heteroscedastic. 30 35 40 45 50 Turn Circle (ft.) a) How would you formally test for heteroscedasticity? Explain using your steps in clear English and using maths. b) Write down here the STATA code that you would put together to execute the test.

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