An agronomist used four test plots to determine the relationship between the wheat yield y (in bushels per acre) and the amount of fertilizer x (in pounds per acre). The results are shown in the table.
?
Fertilizer, x100150 200 250 Yield, y35 44 50 56 ?
(I) Use the regression capabilities of a graphing utility or a spreadsheet to find the least squares regression line for the data.
?
(II) Estimate the yield for a fertilizer application of 160 pounds per acre.
?
A. (I) 
; (II) 39.10
B. (I) 
; (II) 45.90
C. (I) 
; (II) 44.18
D. (I) 
; (II) 42.32
E. (I) 
; (II) 54.94
Answer: C
Mathematics
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