Scientists conduct a study in which 100 adults with chronic diarrhea are divided into 2 groups of 50 people.One group is given a supply of yogurt that contains a certain kind of bacteria and the other group is given yogurt that is bacteria free.The study's participants and researchers do not know which group of subjects has the bacteria in the yogurt and which group does not.The scientists instruct the participants to eat the entire 8 ounces of yogurt once a day for a month and record the their bowel habits.This is an example of a(n)____ study.
A)hypothetical
B)uncontrolled
C)introspective
D)double-blind

Question

Quizplus · Accepted Answer

This study is an example of a double-blind study because both the participants and the researchers are unaware of which group is receiving the yogurt with the bacteria and which is receiving the bacteria-free yogurt. Double-blind studies are conducted to reduce bias and increase the reliability of the results.

Scientists Conduct a Study in Which 100 Adults with Chronic