For His Research Study,Dr

question 38

Multiple Choice

For his research study,Dr.Safar wants to make sure that his sample is a representative one.The most effective way for him to do this is to

• A) use random selection.
• B) calculate the correlation coefficient.
• C) make sure that the standard deviation is low.
• D) use a scatter diagram.

---

Definitions:

Sleep Apnea

Inability to breathe during sleep, causing a sleeper to wake up to breathe.

REM Without Atonia

A sleep disorder characterized by the lack of muscle paralysis that normally occurs during REM sleep, leading to physical motion and dream enactment.

Jet Lag

A temporary sleep disorder that occurs when a person's internal body clock is out of sync with the time cues in a new time zone, often experienced after long flights across multiple time zones.

René Descartes

A 17th-century French philosopher, mathematician, and scientist who is often considered the father of modern philosophy. He is best known for his statement, "I think, therefore I am."