Term
| interquartile range (IQR) |
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Definition
| the distance between the lower and upper quartiles: IQR = Q(U) - Q(L) |
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Term
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Definition
| the 25th percentile of a data set |
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Term
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Definition
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Term
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Definition
| the 75th percentile of a data set |
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Term
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Definition
| an observation (or measurement) that is unusually large or small relative to the other values in a data set |
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Term
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Definition
1.the measurement is observed, recorded, or entered into the computer incorrectly
2.the measurement comes from a different population
3.the measurement is correct, but represents a rare (chance) event |
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Term
| sample z-score (for a measurement x) |
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Definition
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Term
| population z-score (for a measurement x) |
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Definition
| z=(x-ยต)/[population standard deviation, or o] |
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Term
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Definition
| For any set of 'n' measurements (arranged in ascending or descending order), a number such that p% of the measurements fall below the 'p'th percentile and (100-p)% fall above it |
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Term
| standard sample deviation |
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Definition
| 's': the positive suuare root of the sample variance, 's squared', s=the sq. root of 's squared' |
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Term
| sample variance (for a sample of 'n' measurements) |
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Definition
| = the sum of the squared distances from the mean divided by (n-1). the symbol 's squared' is used to represent the sample variance |
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Term
| range (of a quantitative data set) |
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Definition
| = the largest measurement minus the smallest measurement |
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Term
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Definition
| the measurement that occurs most frequently in the data set |
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Term
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Definition
| data for which one tail of the distribution has more extreme observations than the other tail |
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Term
| median (of a quantitative data set) |
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Definition
| the middle number when the measurements are arranged in ascending (or descending) order |
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Term
| mean (of a set of quantitative data) |
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Definition
| the sum of the measurements divided by the number of measurements contained in the data set |
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Term
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Definition
| the class relative frequency multiplied by 100 |
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Term
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Definition
| the class frequency divided by the total number of observations in the data set |
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Term
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Definition
| the class frequency divided by the total number of observations in the data set |
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Term
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Definition
| the class frequency divided by the total number of observations in the data set |
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Term
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Definition
| the number of observations in the data set falling in a particular class |
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Term
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Definition
| one of the categories into which qualitative data can be classified |
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