A trial of the intravenous medication remdesivir was conducted in adults 60 and older. patients were randomly assigned to receive either remdesivir or a placebo for up to 10 days. the primary outcome measured was the time to recover. preliminary results from the 1963 patients (997 randomly assigned to get remdesivir and 966 to get the placebo) indicated that those who received remdesivir had a median recovery time of 11 days as compared with 17 days in those who received the placebo. this result was statistically significant describe the control group. what is the explanatory variable? what were the response variables? what were the results of the study did the researchers use any blinding? if so, what was blinded? are the results generalizable to all adults?