In an experiment to determine the effects of Nitrogen fertil…

In an experiment to determine the effects of Nitrogen fertilizer rate on grain yield in wheat, a set of randomized and replicated plots (24 plots in total) are planted to “Amazon” wheat. 1/3 of the plots receive no fertilizer, 1/3 receive 50 lbs of N per acre, and 1/3 of plots receive 100 lbs of N per acre. At the end of the growing season the wheat grain is harvest and the yields are measured. Which of the following statements are true?