Answer:
(a)
Use random selection to pick 10 calves to inoculate.(you didn't mention this option in the question instead you mix it with other option)
(B).No placebo is being used.
(F).After inoculation, test all calves to see if there is a difference in resistance to infection between the two groups.
(b)
(C).No placebo is being used.
(E).Use random selection to pick nine schools to visit.
(A).After the police visits, survey all the schools to see if there is a difference in views between the two groups.
(c)
(F.)A placebo patch is used for the remaining 35 volunteers in the second group.
(E).Use random selection to pick 40 volunteers for the skin patch with the drug.
(G).Then record the smoking habits of all volunteers to see if a difference exists between the two groups.
Step-by-step explanation:
In question one the answer is mixed with other option so the correct answer statements are provided along with the option for all questions. Placebo is not used in question (a) scenario because it is mentioned in the statement that there is enough vaccine is present and sample of 10 calves is selected from 22 calves and we test all calves after the inoculation because it is mention that blood test should be done on all calves.
Placebo is not used in question (b) scenario because it is mentioned in the statement that the police department can visit half of 18 schools and random sample of 9 schools are selected and it is mentioned in the statement that survey is sent to all 18 school so after the police visit all schools are surveyed to see the difference in views
Placebo patch is used in question (c) because it is mentioned in the statement that 40 out of 75 received the new skin patch so, the remaining 35 received placebo patch and random sample of 40 volunteers are selected for new skin patch. It is mentioned in the statement that each subject is survey so in the end smoking habits of all volunteers are recorded.
