Reducing Cholesterol. A doctor wants to study the effect of a drug to reduce cholesterol levels as measured by a standard blood test. a. In addition to the given factor, suggest three other factors that might be of interest. b. What would be the levels of each factor in your study? c. Specify whether each factor is experimental or observational. d. What are the experimental units? e. How would you select your experimental units and assign them to the treatment combinations?

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