Two Proportion Difference Review - CI and Hypothesis test - Protected View - Saved to this PC . And References Mailings Review View Help Acrobat contain viruses. Protected View. Enable Editing 2) In 1954 an experiment was conducted to test the effectiveness of the Salk vaccine as protection against the devastating effects of polio. With their parents' consent, 200.745 children were injected with the vaccine, while 201,229 other children were injected with an ineffective saline solution. The experiment was "double blind" because the children being injected didn't know whether they were given the real vaccine or the placebo, and the doctors giving the injections didn't know either. The children were monitored for a period of years to determine if they developed paralytic polio. Thirty-three of the 200,745 vaccinated children later developed paralytic polio, whereas 115 of the 201,229 injected with the saline solution later developed paralytic polio ("An Evaluation of the 1954 Poliomyelitis Vaccine Trials." American Journal of Public Health, 1955). Does the data provide sufficient evidence to conclude that the Salk vaccine is effective at lowering the risk of developing polio? Perform a hypothesis test to answer this question. Focus 85 O W DELL