"How would we use a randomized two treatment experiment in each of the following settings? Is placebo being used or not? A) A veterinarian want to test a strain of antibiotic on calves to determine their resistance to common infection. In a pasture are 22 newborn calves. There is enough vaccine for 10 calves. However, blood tests to determine resistance to infection can be done on all calves. B) The Denver Police Department wants to improve its image with teenagers. A uniformed officer is sent to a school one day a week for 10 weeks. Each day the officer visits with students, eats luch with students, attends pep rallies, and so on. There are 18 schools, but the police deparment can visit only half of these schools this semester. A survey regarding how teenagers view police is sent to all 1

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