A study recruited 48 overweight adults aged 55 to 75 years, and randomly divided them into two groups. Participants in one group drank 2 cups of water prior to their meals; the other group did not. All participants ate a low-calorie diet during the study. Over the course of 12 weeks, water drinkers lost about 15.5 pounds, while the non-water drinkers lost about 11 pounds, on average.
Which type of study is this?

Question

Quizplus · Accepted Answer

This is a completely randomized experiment because participants were randomly assigned to one of the two groups (water drinkers vs non-water drinkers) and an intervention was applied (drinking 2 cups of water prior to meals). The study also had a control group (non-water drinkers) and measured the effect of the intervention (drinking water) on weight loss.

A Study Recruited 48 Overweight Adults Aged 55 to 75