Humans obtain approximately ____% of their energy from nonrenewable, nonsustainable resources such as oil, coal, and gas
a. 30
b. 50
c. 70
d. 90
D
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Over the course of the 20th and 21st centuries, life expectancy has
a. stabilized b. decreased c. increased d. fluctuated
Vomiting is used by people with bulimia to ____
a. prevent weight gain b. avoid bacteria c. gain attention d. act independently
Age by itself does not cause suicide
Indicate whether the statement is true or false
Harold read about a cross-cultural study demonstrating an association between consumption of omega-3s and _____. Thinking it will help him, he wants to run to the health store to buy a bottle. His wife, Kara, is more skeptical. She thinks that the relationship might have to do with international differences in the propensity to seek help, rather than the health benefits of omega 3s. Kara is _____.
A) obsessive-compulsive disorder; wondering about the external validity of the study B) obsessive-compulsive disorder; skeptical about the internal validity of the experiment C) depression; questioning the statistical significance of the findings D) depression; positing the existence of a third variable