. a standard drug is known to be effective in 72 percent of the cases in which it is used to treat a certain infection. a new drug has been developed and testing has found it to be effective in 42 cases out of 50. this is potential evidence that the new drug is more effective than the old one. what is the null hypothesis and what is the alternative hypothesis? find the p-value in two ways: (a) using the binomial cdf and (b) using normal approximation with correction for continuity.