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21. The number of new contributors to a public radio station's annual fund drive over the last ten years is 83, 88, 68, 78, 98, 113, 121, 148, 168,

21. The number of new contributors to a public radio station’s annual fund drive over the last ten years is
83, 88, 68, 78, 98, 113, 121, 148, 168, 208
Develop a trend equation for this information, and use it to predict next year’s number of new contributors.

Answer:
Trend Equation =




T t 2 Yt Y*t Forecast Forecast Error
1 1 83 83
2 4 88 176
3 9 68 204
4 16 78 312
5 25 98 490
6 36 113 678
7 49 121 847
8 64 148 1184
9 81 168 1512
10 100 208 2080
55 385 1173 7566

Mean of t =
Mean of Y =

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525686_STAT.xls

21. The number of new contributors to a public radio station’s annual fund drive over the last ten years is
83, 88, 68, 78, 98, 113, 121, 148, 168, 208
Develop a trend equation for this...

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