Question 7 1 pts The experiment that you perform exposed one group to a vaccine injection and another group to a placebo (saline solution injection). What type of experiment was conducted? Controlled clinical trial Observational cohort study Observational case study
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The experiment involves two groups: one receiving a vaccine injection and the other receiving a placebo (saline solution). This is a controlled experiment because the researcher is manipulating the independent variable (type of injection). Show more…
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state whether the investigation in question is an observational study or a designed experiment. Justify your answer in each case. The Salk Vaccine. In the 1940s and early 1950s, the public was greatly concerned about polio. In an attempt to prevent this disease, Jonas Salk of the University of Pittsburgh developed a polio vaccine. In a test of the vaccine’s efficacy, involving nearly 2 million grade-school children, half of the children received the Salk vaccine; the other half received a placebo, in this case an injection of salt dissolved in water. Neither the children nor the doctors performing the diagnoses knew which children belonged to which group, but an evaluation center did. The center found that the incidence of polio was far less among the children inoculated with the Salk vaccine. From that information, the researchers concluded that the vaccine would be effective in preventing polio for all U.S. school children; consequently, it was made available for general use.
Adi S.
State whether the investigation in question is an observational study or a designed experiment. Justify your answer in each case. In the 1940 s and early 1950 s, the public was greatly concerned about polio. In an attempt to prevent this disease, Jonas Salk of the University of Pittsburgh developed a polio vaccine. In a test of the vaccine's efficacy, involving nearly 2 million grade-school children, half of the children received the Salk vaccine; the other half received a placebo, in this case an injection of salt dissolved in water. Neither the children nor the doctors performing the diagnoses knew which children belonged to which group, but an evaluation center did. The center found that the incidence of polio was far less among the children inoculated with the Salk vaccine. From that information, the researchers concluded that the vaccine would be effective in preventing polio for all U.S. school children; consequently, it was made available for general use.
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