An Agricultural Company Wanted to Know If a New Insecticide

Multiple Choice

An agricultural company wanted to know if a new insecticide would increase corn yields.
Eight test plots showed an average increase of 3.125 bushels per acrE.The standard deviation of the increases was 2.911 bushels per acre .Determine a 90% confidence interval for the mean increase in yield.

A) (2.435, 3.815)
B) (1.175, 5.075)
C) (2.435, 5.075)
D) (1.175, 3.815)
E) (-5.075, -3.815)