Need to know if dependent or independent

A nutritionist wishes to compare the mean weight loss from random samples of dieters who did different types of diets: sample A did the water diet and sample B did the juice diet A statistics instructor wishes to compare the means from pre-test and post-test scores from each student in one of her classes A nutritionist wishes to compare the mean weight loss from a random sample of dieters who weigh themselves before the diet and after the diet 1_ independent 2_ dependent