Any two features of social custom

[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.

The federal reserve collects information about which of the following? (select all that apply.)

What information is necessary in order to make a report on suspected domestic abuse? the unembellished facts or evidence you know about the patient’s permission regardless of age the relevant medical records if a patient is taking medication the consent of a parent or guardian if the patient is under the age of 18