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[120 total points] (public health) in one of the largest human experiments ever conducted, in 1954 a randomized controlled trial was run to see whether a vaccine developed by a doctor named jonas salk was effective in preventing paralytic polio. a total of 401,974 children (ages 6–9), chosen to be representative of those who might be susceptible to the disease, were randomized to two groups: 200,745 children (the control group c) were injected with a harmless saline solution (a placebo) and the other 201,229 children (the treatment group t) were injected with salk’s vaccine.what was the point of giving saline solution to the children who didn’t get the vaccine? explain briefly.

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Desiree has a scientific question that she wants to investigate. she has developed a hypothesis and method for her experiment. which step of scientific inquiry should desiree take next? desiree should present her findings to her teacher and classmates. desiree should collect data, which may support or refute her hypothesis. desiree should provide an explanation for her results.