Foresters use regression to predict the volume of timber in a tree using easily measured quantities such as diameter. Let y be the volume of timber in cubic feet and x be the diameter in feet (measured at 3 feet above ground level). One set of data gives y hat=-30+60x. The predicted volume for a tree of diameter = 18 inches is
A. 1050 cubic feet.
B. 90 cubic feet.
C. 60 cubic feet.

Question

Foresters use regression to predict the volume of timber in a tree using easily measured quantities such as diameter. Let y be the volume of timber in cubic feet and x be the diameter in feet (measured at 3 feet above ground level). One set of data gives  y hat=-30+60x. The predicted volume for a tree of diameter = 18 inches is 
 A. 1050 cubic feet. 
B. 90 cubic feet. 
C. 60 cubic feet.

anonymous · Answer

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