II. Plot a histogram of the residuals and comment. III. Determine if your model is an adequate forecast model by conduct h. Make a one-quarter (2017Q1) forecast for these exchange rates using all What is the MAPE for this time period if the actual value is 112.73? Based o forecast, which method would you consider to be more accurate? Question 3: Quarterly sales (in millions of dollars) from 1985 to 2016 of the clothing sto the Excel data set Q3_GAP. a. Draw a time plot of this time series. What components are present in the a suitable decomposition model to fit to this series? Justify your answer. b. Calculate the four-period moving average, MA(4), and the centered movi c. Complement your time plot of the original series ( ), ) with the deseas quarters have no CMA value. Why is this? d. Describe the trend movement that is suggested by this adjusted series. e. Calculate the seasonal indices. Are they consistent with your expectation perform(s) better than the expected sales