Confidence Interval question. See question details:

Data Science Interview QuestionsCategory: Data ScienceConfidence Interval question. See question details:
MockInterview Staff asked 5 years ago

We are trying to test whether a new low fat diet actually helps obese people lose weight. 
100 randomly assigned obese people are assigned to group 1 and put on the low fat diet. Another 100 randomly assigned obese people are assigned to group 2 and put on a diet of approximately the same amount of food, but not as low in fat.
After 4 months, the mean weight loss was 9.31 lbs for group 1 (s = 4.67) and 7.40 lbs (s = 4.04) for group 2.