Question 3

A study was conducted to investigate the effectiveness of a new drug for treating Stage 4 AIDS patients. A group of AIDS patients was randomlv divided into two groups. One group received the new drug; the other group received a placebo. The difference in mean subsequent survival {those with drugs - those without drugs] was found to be 1.04 vears and a 95% confidence interval was found to be 1.04 i 2.3? vears. Based upon this information: Hint: Does the Cl cover 0? O we can conclude that there is no evidence that the drug was effective because the 95% confidence interval covers zero O we can conclude that the drug was ineffective because those taking the drug lived, on average, 1.04 vears less Q We can make no conclusions because we do not know the sample size nor the actual mean survival of each group. Q We can conclude that the drug was effective because those taking the drug lived. on average. 1.04 years longer