GRE (Graduate Record Examinations) Psychology Measurement and Methodology-Statistical Procedures Study Material (Page 9 of 24)

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# Distributions: Probability Distributions

## Probability Distributions

Probability theory is the foundation for statistical inference. A probability distribution indicates the values that a random variable may have.

A random variable is one whose outcome, whose values are not influenced by the researcher. They are simply random. When choosin

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# Frequency Distribution & Skewness: Coefficient of Skewness (SK)

Frequency polygon represents the frequency distribution of discreet variables. Frequency distribution is sometimes only called distribution. For continuous variables, frequency distribution curves are continuous, giving frequency for all possible values. Such frequency distribution curves can be symmetrical of skewed on one side. Curve is symmetrical if mean, median, and mode fall at highest point on the curve.

If the s

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