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21 Cards in this Set
- Front
- Back
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central tendency |
statistics that are located near the center of a set of scores |
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coefficient of variation |
a standardized measure of dispersion of a probability distribution or frequency distribution |
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descriptive statistics |
mathematics used to organize, summarize, and describe data |
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interquartile range |
a measure of variability based on dividing a data set into quartiles. Quartiles divide a rank-ordered data set into four equal parts. |
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mean |
a calculated central value of a set of numbers |
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median |
the number at the midpoint of a set of numbers when the set is ordered from greatest to smallest |
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measurement |
the act of assessing |
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mode |
the number that occurs most often in a set of numbers |
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normal curve |
a bell-shaped curse showing a particular distribution of probability over the values of a random variable |
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percentile |
the percentage of observations occurring at or below a given score |
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percentile rank (PR) |
the percentage of scores that fall at or below a given score |
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range |
a measure of variability obtained by subtracting the lowest score from the highest score |
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raw score |
original data that has not been transformed |
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standard deviation |
a linear measure of variability that takes into account every score in the distribution; the square root of the variance |
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standard scores |
a set of scores that have the same mean and standard deviation so they can be compared |
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statistics |
the practice of collecting and analyzing numerical data in large quantities |
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t score |
t=[x-u]/[s/sqrt(n)] where x is the sample mean, u is the population mean, s is the standard deviation of the sample, and n is the sample size |
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variable |
a symbol for a number we don't know yet |
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variability |
the spread, or dispersion, of scores in a set of data, the result of the fact that not all scores are exactly the same |
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variance (s^2) |
a measure of variability; a measure of the spread of a set of scores based on the average squared deviation of each score from the mean |
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z-score |
a statistical measurement of a score's relationship to the mean in a group of scores. A z-score of 0 means the score is the same as the mean |
