Question

7. In a study doctors reported on the accuracy of using MRIs to evaluate ligament sprains and tears on 35 patients. Consecutive patients with acute or chronic knee pain were selected from the clinical practice of one of the doctors and agreed to participate in the study. a. Describe the sampling plan used to select study participants b. Can valid inferences be made using the results of this study? Why or why not? c. Devise an alternative sampling plan. What would you change? 8. The taste test for PTC (phenylthiocarbamide) is a favorite exercise for human genetics classes. It has been established that a single gene determines the characteristic, and that 70% of Americans are “tasters”, while 30% are “nontasters”. Suppose that 20 Americans are randomly selected. a. What is the probability that at least 17 are “tasters”? b. What is the probability that 18 or less are “non-tasters”?

Answer 1