UESTlDN 2: The data set fancy {you need to library the fpp package to get the dataset} concerns the monthly sales gures of a shop which opened in January 198? and sells gifts, souvenirs. and novelties. The sales volume varies with the seasonal population of tourists. {a} Produce a time plot of the data and describe the patterns in the graph. Identify any unusual or unexpected uctuations in the time series. {b} Use R function tslm to t a regression model to the logarithms of these sales data with a linear trend and seasonal component. [c] Use multiple regression with trend variable and seasonal dummy variables to redo the regression as shown in the lecture example. Check: to see that you obtain the same results as tslm