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. An optometrist is interested in the effects of different brands of eye drops. She wants to know if different drops affect the accuracy of a standard vision test. Some researchers think that a new brand: Brand A may have more adverse effects on an individual's ability to correcy report the letters in the vision test than the common brand: Brand B. There is also some speculation that the effect of the drops on vision differs dramatically for individuals who are farsighted compared to those who are nearsighted. The optometrist hires you to design an experiment that tests the effect of the eye drops on test performance. You tell her there are two possible approaches to take: a randomized comparative approach or a matched pairs design. Describe how you would use each design to test the effect ofthe eye drops on test performance on a random sample of patients. Remember, there is a concern about the effects for near vs. farsighted patients. As much as possible, use diagrams instead of words to summarize your experimental design. How many subgroups would you need to complete the experiment? Describe a strategy for randomization that fullls your previous answer: Discuss what might be a possible response variable. In addition, you should identify at least one confounding Edibles and discuss a method of controlling for one otthis variable. 2. A farm cooperative has asked you to design an experiment that measures the effects of light exposure on the growth of tulips in the Skagit Valley of Washington State. You hypothesize that tulips exposed to more direct light will grow at a faster rate than those exposed to less light. You also wonder whether the effects of light exposure persist when you control for the amount of moisture the plants receive. You want to create a randomized comparative design that considers three factors with the following levels: Amount of Light Exposure (0 hours a day, 3 hours a day, 6 hours a day, 9 hours a day) Amount of Moisture Exposure (1 hour a day, 3 hours a day, 5 hours a day) You have 100 seedling plants at each of 12 different nurseries to use in your experiment. Your experiment should run six months in length. Outline the details of your experiment. How many subgroups would you need to complete the experiment? Describe a strategy for randomization that fulfills your previous answer: Discuss what might be a possible response variable. In addition, you should identify at least one confounding variables and discuss a method of controlling for one of this variable