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A pharmacologist is interested in determining whether or not three different psychoactive drugs differ in how long they remain in the body before they are excreted or metabolized. The pharmacologist randomly assigned 18 subjects to three different groups and recorded the number of days the drugs remained at measurable levels in each subject. The results are presented below.
a. Is there a difference in the time it takes for these drugs to be cleared from the subjects? (Use a = 0.05).
b. Which drugs are different in how long they remain in the subjects? (Use a = 0.05 and the HSD test).
c. Same as part b , but using the Scheffé test.
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