QUESTION 10 With reference to regression analysis: (a) Why is multi-collinearity not a problem in simple regression? (b) What is the coefficient of determination and what does it measure? (c) What is the adjusted coefficient of determination used for? (d) What is heteroskedasticity of the error terms and why is it a problem? (e) What is auto (or serial) correlation of the error terms and why is it a problem? (f) What are the four components of a time series? (g) For the trend component of a time series, what are the three main types of trends