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SPED 310 Chapter 3 Boone
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Terms in this set (25)
Bimodal Distribution
A distribution with two modes.
Correlation
The relationship between two variables.
Correlation Coefficient
A numerical value that expresses the degree of relationship between two variables.
Descriptive Statistics
Statistics that describe and summarize data in a meaningful fashion.
Frequency Distribution
Expresses how often a score occurs in a set of data.
Interval Scale of Measurement
An interval scale is one in which equal differences in scores represent equal differences in amount of the property measured but with an arbitrary zero point.
Mean
The arithmetical average of the distribution of scores.
Measures of Central Tendency
The mean, median, and mode of a distribution of scores.
Median
The middle score in a distribution. It is the score that separates the top half of the test takers from the bottom half.
Mode
The score in the distribution that most frequently occurs.
Multimodal Distribution
A distribution with three or more modes.
Negative Correlation
An inverse relationship; variables are said to be negatively correlated when a high score on one is accompanied by a low score on the other. Conversely, low scores on one variable are associated with high scores on the other.
Negatively Skewed Distribution
A distribution in which more of the scores fall above the mean.
Nominal Scale of Measurement
Nominal data are categorical data. Assigning observations into various independent categories and then counting the frequency of occurrence within each of the categories creates a nominal scale.
Normal Curve (Bell Curve)
In this frequency polygon, most of the scores cluster around the mean. The farther above or below the mean a score appears, the less frequently it occurs.
Normal Distribution
Represents the way test scores would fall if a particular test is given to every single student of the same age or grade in the population for whom the test was designed.
Ordinal Scale of Measurement
Ordinal scales involve the rank order system. It is a scale in which scores indicate only relative amounts or rank order.
Positive Correlation
A direct relationship; variables are said to be positively correlated when a high score on one is accompanied by a high score on the other. Conversely, low scores on one variable are associated with low scores on the other.
Positively Skewed Distribution
A distribution in which more of the scores fall below the mean.
Range
The difference between the high score and the low score in the distribution.
Ratio Scale of Measurement
A scale having interval properties except that a score of zero indicates a total absence of the quality being measured. A score of zero means zero.
Skewed Distribution
A distribution in which the majority of scores falls at either the high end or the low end rather than the middle of a distribution.
Standard Deviation
The spread of scores around the mean.
Variance
A statistical concept that tells the spread of scores within a distribution.
Zero Correlation
No relationship between the variables, so that a change in one is not associated with a change in the other.
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