Suppose you want to determine whether taking vitamins every day helps people lose weight.You survey 200 people who had been on a weight loss program for six months, and ask them whether or not they take vitamins every day, and how much weight they lost.Suppose you found that the people who lost the most weight were more likely to have taken vitamins every day.Does this mean vitamins caused the additional weight loss? Explain why or why not.

Question

Quizplus · Accepted Answer

The Answer is No; this was an observational study, not a controlled experiment.other factors could explain the weight loss, such as a healthy lifestyle (people who are health conscious may be more likely to take vitamins).

Suppose You Want to Determine Whether Taking Vitamins Every Day