a. Explain in detail, what are the indicators needed to have a good forecast result? (5 marks) b. The following Table-1 shows the demand for a Managerial Economics text book Table 1. Managerial Economics Book Sales Months Demand for hand phones (units) January 20 February 35 March 29 April 30 May 34 Based on the book sales information given: i. Calculate the forecast period from June until December 2021 using the linear estimation technique. (8 marks) ii. Apply the moving average technique with two periods of range and calculate the forecast period from June until December 2021. (8 marks) iii. Which forecast techniques are more accurate? Explain. (4 marks)