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| The values in a population as a whole. |
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| The values of a sample (n). |
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| Several values can describe this, including; mode, median, mean, outliers, weighted mean, percentiles, and quartiles. |
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| Only measure of central tendency on a nominal scale, the most frequent item in the data set. |
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| The value that has an equal number of items above and below it. |
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| The arithmetic average and is the most common measurement of central tendency when data are measured on an interval or ratio scale. |
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| Rare observations in the tail of a distribution. |
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Calculated from data arranged in a frequency distribution. x = Σfx/Σf
Σfx = sum of products (values of x and their frequencies) Σf = sample size (n) |
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| Divide up an array of data into 100 slices. So if you score in the 90th percentile 90/ of other people scored below you. |
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| Divides the bottom quarter from the top three quarters and is the same as the 25th percentile. |
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Term
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Definition
| Also called the median (50th percentile), it divides the bottom two quarters from the top two quarters. |
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| Divides the top quarter from the bottom three quarters. |
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| The variation in observations around the mean (or median). |
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| The difference between the largest and smallest items in the sample. |
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| The differences between the third and first quartiles and represents the spread of the middle 50% of the (ordered) values. |
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Definition
| Used to illustrate the locations of the median, interquartile range, and range, and is often used to compare these characteristics in different groups. |
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Definition
| A measure of the average amount by which each observation is a series of observations differs from the mean. |
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Term
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Definition
| Represents the average of the squared deviations in the sample. |
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