(Answered) Compare two doses of a drug a drug manufacturer is studying

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Compare two doses of a drug. A drug manufacturer is studying how a new drug behaves in patients. Investigators compare two doses: 5 milligrams (mg) and 10 mg. The drug can be administered by injection, by a skin patch, or by intravenous drip. Concentration in the blood after 30 minutes (the response variable) may depend both on the dose and on the method of administration.

(a) Make a sketch that describes the treatments formed by combining dosage and method. Then use a diagram to outline a completely randomized design for this two-factor experiment

(b) "How many subjects?" is a tough issue. We will explain the basic ideas in Chapter 8. What can you say now about the advantage of using larger groups of subjects?

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