(b)The level of economic activity in a region has been recorded over a period of four years as presented below.

b. if a straight line offers a good fit. c. whenever you want to make a prediction. d. when the seasonal variation is minimal. (b) The level of economic activity in a region has been recorded over a period of four years as presented below. Year Quarter Activity Year Quarter Activity Level Level 1 105 3 118 2 99 109 3 90 3 96 - + 110 127 2 111 4 126 104 115 93 100 119 4 135 i. Construct a graph for the data. (3 marks) ii. Find a centered four-point moving average trend and place it on your graph. I (6 marks) iii. Calculate the corresponding additive seasonal components. (4 marks) its Predict the level of activity for first quarter of vear five. (2 marks)