Question: 2.5.2 Perimeter Security (Pty) Ltd forecasts the following demand for its most popular alarm system, called the Wireless Tech Pro. Use the demand data in

2.5.2 Perimeter Security (Pty) Ltd forecasts the following demand for its most popular alarm system, called the Wireless Tech Pro. Use the demand data in the table below and answer the questions that follow. Month February March April May June July Actual demand AOM4801/2023/ASSIGNMENT 02 420 400 411 390 Important note: 430 440 NB: Carry all calculations through to two decimal places after the comma. a) Calculate the four-period moving-average forecasts for June and July. b) Calculate the single exponential smoothing forecasts (with a of 0.4) for June and July. Assume that the forecast for the May period is 415. (2) (2) c) Calculate the Mean absolute deviation (MAD) for each method. Based on your calculation, state which method is better in this instance and justify your answer. (3) TIP: For your own study purposes, remember to also practise calculating the Mean squared error (MSE) as well as the Mean absolute percentage error (MAPE).

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