TMS4033 Statistical Data Analysis - Tutorial 3 Refer to the Airfreight breakage problem. a. Prepare a dot plot for the number of transfers Xi. Does the distribution of numbers of transfers appear to be asymmetrical? The cases are given in time order. Prepare a time plot for the number of transfers. Is any systematic pattern evident in your plot? Discuss. Obtain the residuals e, and prepare a stemandleaf plot of the residuals. What information is provided by your plot? Plot the residuals ei against X,- to ascertain whether any departures from regression model Y,- =o + lX 1- + 8,- are evident. What is your conclusion? Prepare a normal probability plot of the residuals. Also obtain the coefficient of correlation between the ordered residuals and their expected values under normality to ascertain whether the normality assumption is reasonable here. Use Table B.6 and a = .01. What do you conclude