Term
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Definition
| Percentiles are values on a scale of 100 that indicate the percent of a distribution that is equal to or below it. |
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Term
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Definition
| A percentile rank is the percentage of cases falling below a given score point. They are used to report the standing of an individual relative to the performance of a known group. If 75% of the cases are belwo a score point of 43, then this score carries a percentile rank of 75. A percentile rank is the percentage of the scores falling below the midpoint of the score. |
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Term
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Definition
| A distribution can be divided into four quartiles or sections. Each quartile refers to a specific score point on the distribution (25th, 50th, and 75th percentiles are three quartiles.) |
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Term
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Definition
| The symbol for a mean is an X with one line above it, or rather X bar. A mean is the sum of all the scores divided by the number of the scores. Most people refer to this as the average. |
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Definition
| This is the number (score) that occurs most frequently or with the greatest frequency. |
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Term
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Definition
| The media, Mdn, is the middle score when the observations are arranged in order of magnitude, so that an equal number of scores falls below and above. |
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