Information: Syringes, pens, jet, injectors, pumps, ports, and even inhalers are the various ways for diabetics to take insulin. Currently most diabetics take insulin using syringes or pens. A research study was completed to compare the effectiveness of these two different methods of delivering insulin to diabetics. Two independent random samples of 100 diabetics comprising Group A (Using syringes) and 100 diabetics comprising Group B (using pens). Both groups were carefully monitored, and their glucose levels measured in mg/dl (milligrams per deciliter) two hours after injections. Their glucose levels were compared and a 95% confidence interval for the true mean glucose levels for Group A minus the true mean glucose levels for Group B was computed to be : ( -11.45, 5.32 ).

1 pts Question 8 Pick the formula most appropriate to use in this problem. & O $ 2 + n1 n2 O O (21 - 32 ) Its + n1 n 2 O + n1 n 2