Between 1972 and 2016,the Number of PACs in the United

question 34

Multiple Choice

Between 1972 and 2016,the number of PACs in the United States

• A)declined from over 7,000 to just 480.
• B)declined from over 1,000 to just 48.
• C)increased from 480 to over 7,000.
• D)remained relatively constant.

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Definitions:

Probability

A numeric scale between 0 and 1 that quantifies how likely an event is to take place.

z

In statistics, 'z' typically refers to a z-score, a measure of how many standard deviations an element is from the mean.

Standard Normal Random Variable

A random variable that has a normal distribution with a mean of 0 and a standard deviation of 1.

P

Sometimes used as shorthand for "P-value," which assesses the strength of evidence against a null hypothesis in statistical testing.