8. (10 points) The Salk Polio vaccine trials of 1954 included a double-blind experiment in which elementary school children of consenting parents were assigned at random to injection with the Salk vaccine or a placebo. Based on the data given in the table below can we say that the proportion of infantile paralysis victims is the same for the placebo and for the Salk vaccine treatments? Set up the appropriate hypothesis and conduct the test at a = 0.05. See Ch 18 in the R&S book and my notes. Infantile Placebo Salk Polio Vaccine paralysis Yes 20 62 Victim No 32 40