Term
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Definition
Statistical procedures that are used to summarize
sets of scores with respect to central tendencies, variability, and
correlations. |
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Term
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Definition
Statistical procedures that allow researchers to
determine whether the results they obtain support their hypotheses or
can be attributed just to chance variation. |
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Term
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Definition
A summary of how frequently each score appears
in a set of observations. |
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Term
| measure of central tendency |
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Definition
A statistic, such as a mean, median, or mode,
that provides one score as representative of a set of observations. |
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Term
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Definition
The score appearing most frequently in a set of observations; a
measure of central tendency. |
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Term
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Definition
The score in a distribution above and below which lie 50 percent
of the other scores; a measure of central tendency. |
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Term
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Definition
The arithmetic average of a group of scores; the most commonly
used measure of central tendency. |
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Term
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Definition
A statistic, such as a range or standard deviation,
that indicates how tightly the scores in a set of observations cluster
together. |
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Term
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Definition
The difference between the highest and the lowest scores in a set of
observations; the simplest measure of variability. |
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Term
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Definition
The average difference of a set of scores from
their mean; a measure of variability. |
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Term
| correlation coefficient (r) |
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Definition
A statistic that indicates the degree of
relationship between two variables. |
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Term
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Definition
The symmetrical curve that represents the distribution of
scores on many psychological attributes; allows researchers to make
judgments of how unusual an observation or result is. |
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Term
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Definition
A difference between experimental groups or
conditions that would have occurred by chance less than an accepted
criterion; in psychology, the criterion most often used is a probability
of less than 5 times out of 100, or p .05. |
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