The number of internal disk drives in millions made at a pla

The number of internal disk drives (in millions) made at a plant in Taiwan during the past 5 years follows: Disk Drives 140 156 190 200 216 Year 4 a) Using simple linear regression, the forecast for the number of disk drives to be made next year - 238.8 disk drives (round your response to one decimal place) b) The mean squared error (MSE) when using simple linear regression = 25.92 drive\' (round your response to one decimal place) c) The mean absolute percentage error (MAPE) when using simple linear regressions | % (round your response to one decimal place)

Solution

difference in percentage

	year	disk drives	estimated	difference	difference square	difference in percentage
	1	140	141.2	1.20	1.44	0.86%
	2	156	160.8	4.80	23.04	3.08%
	3	190	180.4	-9.60	92.16	5.05%
	4	200	200	0.00	0	0.00%
	5	216	219.6	3.60	12.96	1.67%
regression equation	19.6	121.6			MAPE	2.13%