QUESTION 9 One is interested in the percentage of doctors who recommend aspirin rather than other painkillers for their patients with headaches. A random sample of 100 doctors' results in 20 who indicate that they recommend aspirin. Determine the 99% confidence interval for the proportion of doctors who recommend aspirin. Hint : VO.16 = 0.4 and V 0.09 = 0.3 . Approximate \\ 120 ~ 1 1 and V/145 ~ 12. O a. [3.55%, 16.45%] O b. [2.96%, 17.04%] O C. [2.26%, 17.74%] O d. [9.68%, 30.32%] O e. [10.62%, 29.38%]