we can follow a downward trend in the above graph .
[IF YOU PROVIDE THE OPTIONS, I WOULD BE ABLE TO ANSWER MORE ACCURATELY]
b) Quadratic trend equation using MINITAB :
Yt = 106.57 - 28.536 t +2.607 t2
[If you need manual calculation of the above, let me know below. ]
Using the above equation forecast for t=8 is :
Yt = 45.13
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