Z Is a Standard Normal Random Variable

question 86

Multiple Choice

z is a standard normal random variable. The P (-2.20 z 2.20) equals

• A) 0.9645.
• B) 0.0355.
• C) 0.0278.
• D) 0.9722.

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Definitions:

Normal Curve

A symmetrical, bell-shaped curve that represents the distribution of many physical and psychological attributes.

Distribution

The act of sharing something out among a number of recipients, or the way in which something is spread or dispersed.

Regression Toward

Implies the statistical concept that extreme scores tend to fall back (regress) toward the mean (average) over time.

Mean

In statistics, the average value in a set of numbers, calculated by adding all the numbers and dividing by the total count of values.