"single proportion problem. suppose that 600 students we selected at random from a student body and given a vaccine to prevent a certain type of flu. the campus reported cases of the flu so the students were exposed. a follow-up survey found that 562 of them did not get the flu. suppose the proportion of the population that does not get the flu tends to be around 90%. conduct a hypothesis test that the true value is not equal to .9. note: this means the standard error will be based on the null value! based on this hypothesis test, i would fail to reject the null hypothesis. group of answer choices"