A researcher surveys people about their reported weight loss

A researcher surveys people about their reported weight loss in the previous month. Which of the following would be a criterion validity of this measure? A. The researcher surveys them a year later about their weight loss. B. The researcher asks the subjects loved ones if they have lost weight. C. The researchers measures their blood pressure. D. The researcher weighs them on a scale and compares their weight at the start and end of the month to determine if they lost weight.

Solution

To measure the weight loss scientifically that will be a valid measure, the researcher should weigh the people on a standard scale and compares their weight at the start and end of the month to determine if they lost weight.

So, in my view, Option (D) iis the correct answer.