Diagnostic Examination SECTION PART A Questions 1-5 Spend about 65 minutes on this part of the exam. Percentage of Section II grade-75 You mus show all work and indicate the methods you use. You will be graded on the correctness of your methods and on the accuracy of your results and explanations. 1. A horticulturist plans a study on the use of compost tea for plant disease management. She obtains 16 identical beds, each containing a random selection of five mini-pink rose plants. She plans to use two different composting times (two and five days), two different compost preparations (aerobic and anaerobic), and two different spraying techniques (with and without adjuvants). Midway into the growing season she will check all plants for rose powdery mildew disease. (a) List the complete set of treatments. (b) Describe a completely randomized design for the treatments above. (c) Explain the advantage of using only mini-pink roses in this experiment. (d) Explain a disadvantage of using only mini-pink roses in this experiment.