Answer:
N = 116 plots of land would be needed for the experiment if the desired power level is 90%
Step-by-step explanation:
A large farm wants to try a new fertilizer to evaluate wether it will improve the farm's yield. The land is broken into identical sized plots that produce an average of 1,215lbs/plot of beans with a SD=94lbs/plot. The owner is interested in detecting any average difference of at least 40lbs/plot. How many plots would be needed for the experiment if the desired power level is 90%?
alpha / 2 = 0.48 Z= 0.05
N = [ 0.05 * 94 / 40 ] ^2
N = 116