Give the answer and analysis, this is the topic of statistics.

Question 5 (a) (b) Consider the following time series data. Develop a three-month moving average forecast for this time series and nd the (5 marks) error for each forecast. Then, compute a forecast for month 8. The following table shows the sales of an electrical item of a company for the year 2017 to 2019. (i) (ii) (iii) Quarter Year Construct a table to show the four-quarter moving average, centered moving average and seasonal irregular value for this time series. (9 marks) Compute the seasonal index for each quarter. (4 marks) Forecast the production for the subsequent period. (2 marks) (Total 20 marks)