If the Random Variable X Is Normally Distributed with a Mean

question 162

Multiple Choice

If the random variable x is normally distributed with a mean equal to .45 and a standard deviation equal to .40, then P(x .75) is:

• A) .7500
• B) .7734
• C) .2266
• D) .2734
• E) .4525

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Definitions:

Pearson's Product-moment Correlation Coefficient

A measure of the linear correlation between two variables X and Y, providing a value between +1 and -1 inclusive.

Frequency Distribution

A method for illustrating how often scores occur in groups called class intervals.

Frequency Polygon

A graphical representation of a frequency distribution that uses a continuous line to show the number of values that fall within a class interval.

Histogram

A graphical representation of a frequency distribution that uses bars of different heights to show the number of values that fall within each class interval.