A clinical trial is performed to test a new drug designed to lower blood sugar levels. One hundred fifty participants are randomly assigned to take the new drug, and 150
participants are randomly assigned to take a placebo. After 6 months of treatment, blood sugar levels are measured and compared to the starting levels. For those who
took the new drug, the blood sugar levels had a mean reduction of 25 points with a standard deviation of 3.1, while for those who took the placebo, the blood sugar
levels showed a mean reduction of 18 points with a standard deviation of 2.8. Assuming the standard deviations are true for the entire population, calculate 90%
confidence intervals and evaluate whether there is evidence the new drug is working

O The interval for the new drug is from 24 584 to 25 416 points. The interval for the placebo is from 17 624 to 18 376 points. Since the interval for the new
drug lies above the interval for the placebo, there is evidence that the drug is working

O The interval for the new drug is from 24 504 to 25 496 points. The interval for the placebo is from 17.552 to 18 448 points. Since the interval for the new
drug lies above the interval for the placebo, there is evidence that the drug is working

O The interval for the new drug is from 24 584 to 25 416 points. The interval for the placebo is from 17.624 to 18 376 points Since the interval for the new
drug lies above the interval for the placebo, there is evidence that the drug is not working
O The interval for the new drug is from 24.504 to 25 496 points The interval for the placebo is from 17.552 to 18.448 points Since the interval for the new
drug lies above the interval for the placebo, there is evidence that the drug is not working