Research Study C Welsh et al. (2002) evaluated the effect of sports drinks on endurance. A group of athletes drank a new carbohydrate-electrolyte drink. The same group was then tested on high-intensity exercises. Endurance was measured by recording the time, in minutes, that each athlete became tired. The scores for the sample of six athletes are: 30, 21, 18, 24, 18, 45. The next three (3) questions will use Research Study C and will require using the computational method for calculating variance and standard deviation