contestada

In an intervention study to determine whether a vegetarian diet can help college women to lose weight, 500 residents of a women's dormitory were divided into two groups: one that ate in a vegetarian dining hall and one that ate a normal diet. women were allowed to choose which group they wished to be in. after three months, the vegetarian group had lost an average of 10 pounds while the control group had not lost weight. what is the most likely source of error in this study?
a. reporting bias
b. the placebo effect
c. random variation
d. selection bias

Respuesta :

I believe the answer is Selection bias
Selection bias refers to any actions conducted in sample selection that could prevent proper randomization of the study.
If the Women are free to choose the type of group like mentioned above, the Women who had the intention to lose weight would be more likely to choose the Vegetarian group.
This makes the result could be caused by the portion , behavioror motivation of the subjects rather than the diet itself.

Otras preguntas