Suppose you were to read about a study showing that people who ...

[Wadzanai]

Suppose you were to read about a study showing that people who sleep less than five hours a night have twice as much risk of a premature death as people who sleep seven or eight hours a night.The baseline risk in this context is
 a. the risk of premature death for people who sleep less than five hours a night.
  b. the risk of premature death for people who sleep seven or eight hours a night.
  c. the risk of premature death for all people.
  d. the risk of premature death at the beginning of the study for those in the study.

Question 2

Suppose you were to read about a study showing that people who sleep less than five hours a night have twice as much risk of a premature death as people who sleep seven or eight hours a night.Can you conclude that sleeping the shorter hours causes a higher risk of premature death?
 a. No, because the result was clearly based on an observational study.
  b. Yes, because the result was clearly based on a randomized experiment.
  c. The answer depends on whether the research was based on an observational study or a randomized experiment, and it isn't obvious which was used.
  d. No, because the baseline risk of premature death is not given.

[cloud]

Answer to Question 1

B

Answer to Question 2

A

[Wadzanai]

Excellent

[kishoreddi]

Gracias!