Based on Evidence Obtained Using Dendrochronology, What Began to Plague

question 14

Multiple Choice

Based on evidence obtained using dendrochronology, what began to plague the Southwest farmers after 1150 CE?

• A) heavy rains
• B) swarms of locust
• C) periodic droughts
• D) hailstorms

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Definitions:

Unemployment Rate

The fraction of people in the labor force who are without jobs and are looking for employment.

Random Sample

A subset of individuals chosen from a larger set (population) in such a way that every member has an equal chance of being included.

Null Hypothesis

A statistical proposition that asserts the absence of a difference or effect, typically to be tested against an alternative hypothesis suggesting a significant effect or relationship.

Null Hypothesis

A default hypothesis that there is no significant difference or effect, used as a basis for statistical testing.