Question

The Agricultural Extension Agent's Office has tracked fertilizer application and crop yields for a variety of chickpea and has recorded the data shown in the following table. Their staff statistician developed a regression model, shown below, that yields an r2 value of 0.79.

Fertilizer	Bushels of Chickpeas	Forecast
10	80
15	115
20	220
25	250
30	225

Bushels of chickpeas = 8 + 8.5 * Fertilizer

Use the information provided above. For every unit of fertilizer applied, the crop yield increases by:

Answer 1

1. Y = A + B * FERTILIZER

A = 8, B = 8.5

THEREFORE, FOR EVERY FERTILIZER, THE YIELD INCREASES BY 8,5

FERTILIZER	BUSHELS	FORECAST
10	80	93
15	115	135.5
20	220	178
25	250	220.5
30	225	263

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