The fitnessgram™ pacer test is a multistage aerobic capacity test that progressively gets more difficult as it continues. the 20 meter pacer test will begin in 30 seconds. line up at the start. the running speed starts slowly, but gets faster each minute after you hear this signal. [beep] a single lap should be completed each time you hear this sound. [ding] remember to run in a straight line, and run as long as possible. the second time you fail to complete a lap before the sound, your test is over. the test will begin on the word start. on your mark, get ready, start.

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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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