Now consider a different transformations of the variable yt. Let gt = ln(yt)ln(yt4) 4 . a. What does the variable gt measure? 2 b. What are the mean and the variance of gt? 3. Now consider a different transformations of the variable yt. Let ft = (ln(yt) ln(yt1)) 4. a. What does the variable ft measure? b. What are the mean and the variance of ft? c. Which one of the variables is more volatile, zt or ft? 4. If yt was measuring the real GDP in the US in billions of chained 2012 dollars, would the assumption of xt being a white noise random variable be reasonable? Explain