Probenecid is a drug used by some athletes to prevent the excretion of other substances into urine, thus lowering their detectable concentrations. a scientist makes three measurements of a urine sample known to contain probenecid and obtains a confidence interval of 11.8+ 0.5 mg/l at the 95% confidence level. what would happen to the confidence interval at the same confidence level if the number of measurements is increased to 10 assuming the standard deviation remains the same? the confidence interval would increase. o the confidence interval would remain constant. the confidence interval would decrease. there is not enough information to determine what would happen to the confidence interval