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| A numerical value used as a summary measure for a sample (e.g., the sample mean (X-bar), Sample Variance (S2), and the sample standard Deviation S). |
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| A measure of central location computed by summing the data values and dividing by the number of observations |
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| A measure of central location provided by the value in the middle when the data are arranged in ascending order. |
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| A measure of LOCATION, defined as the value that occurs with greatest frequency. |
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| A measure of variability, defined to be the largest value minus the smallest value. |
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| Interquartile Range (IQR) |
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| A measure of variability, defined to be the difference between the 3rd and 1st quartiles. |
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| A measure of variability based on the squared deviations of the data values about the mean. |
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| A measure of variability computed by taking the positive square root of the variance. |
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| A measure of relative variability computed by dividing the standard deviation by the mean and multiplying by 100. |
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| A measure of the shape of a data distribution. Data skewed to the left result in negative skewness; a symmetric data distribution results in zero skewness; and data skewed to the right result in positive skewness. |
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| A theorem that can be used to make statements about the proportion of data values that must be within a specified number standard deviations of the mean. |
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| A rule that can be used to compute the percentage of data values that must be within one,two, and three standard deviations of the mean for data that exhibit a bell-shaped distribution. |
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| An exploratory data analysis technique that uses five numbers to summarize the data: smallest value, first quartile, median, third quartile, and largest value. |
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| A graphical summary of data based on a five-number summary. |
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| A measure of linear association between two variable. Positive values indicate a positive relationship; negative values indicate a negative relationship. |
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| The mean obtained by assigning each observation a weight that reflects its importance. |
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| Data available in class intervals as summarized by a frequency distribution. Individual values of the original data are not available. |
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