Ch 5: Measures of Dispersion Flashcards by Chris Tyler

Q

What is Dispersion?

A

Spread of scores in a distribution

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Q

What is Range?

A

Difference between highest and lowest scores

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Q

What is the Interquartile Range (IQR)?

A

Range of middle 50% of scores

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Q

What is the Deviation Score?

A

Distance of a score from the mean

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Q

What is the Sum of Squares (SS)?

A

Sum of squared deviation scores

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Q

What is the Population Variance (σ²)?

A

Average squared deviation in a population

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Q

What is the Sample Variance (s²)?

A

Estimated average squared deviation in a sample

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Q

What is the Population Standard Deviation (σ)?

A

Square root of population variance

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Q

What is the Sample Standard Deviation (s)?

A

Square root of sample variance

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Q

What are the Degrees of Freedom (df)?

A

n-1 in variance calculations

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Q

What is the Empirical Rule?

A

68-95-99 rule for normal distributions

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Q

What is the H-spread?

A

Another term for interquartile range

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Q

What is an Outlier?

A

Score falling outside normal range of distribution

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Q

What is a Squared Deviation?

A

Squared distance from mean

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Q

What is Robust?

A

Resistant to influence of outliers

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Q

What are Standard Units?

A

Original units of measurement

Q

What is a Normal Distribution?

A

Bell-shaped, symmetric distribution

Q

What is Sampling Stability?

A

Consistency of measures across samples

Q

What are Extreme Scores?

A

Values far from the center of distribution

Q

What is Variability?

A

Overall spread or dispersion in dataset