On analyzing your time series data you suspect thatthe data represented as y1, y2, y3, … , yn-1, ynmay have
a trend component that is quadratic in nature. Which pattern of data will indicate that the trend in the time
series data is quadratic in nature?

A.
(y3-y2) (y2-y1) = ………= (yn-yn-1)-(yn-1-yn-2)

B.
(y2-y1) = (y3-y2) = ……. = (yn-yn-1)

C.
((y2-y1) /y1 ) * 100% = …….((yn-yn-1)/yn-1) *100%

D.
(y4-y2) (y3-y1) = ………= (yn-yn-2)-(yn-1-yn-3)