Question

A study of sleep patterns randomly selected participants in the study to sleep in either a dark room or a room with light. Which element of experiment design is know to be a part of this study ?

Answer 1

The answer is randomization

Answer 2

The element of the experiment design that is known to be a part of this study is randomization.

Explanation:

The study is about sleep patterns, so in order for the results to be accurate, the choice of which participants will sleep in the dark room or the room with light has to be random.