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20 Cards in this Set
- Front
- Back
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Descriptive Statistics |
A way to quickly summarize data within a set using just a few numbers. |
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Mean |
The average of a set calculated by adding all the values in the set and dividing by the number of values in the set. (Very sensitive to outliers) |
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Outlier |
A value or values significantly higher or lower than the rest of the set that can skew the mean of a set. |
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Median |
The middle value in a data set. (Not very sensitive to outliers) |
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Mode |
The value that appears most often in a set. |
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Bimodal |
When a set has 2 modes. |
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Multimodal |
When a set has more than 2 modes. |
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Standard Deviation |
A measurement of the amount of variation from the mean in a data set. |
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Five Number Summary |
The minimum, first quartile, median, third quartile, and maximum of a data set. (Each quartile is 25%) |
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Range |
The distance between the maximum and minimum. |
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Interquartile range (IQR) |
The distance between the third and first quartiles. |
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Boxplot |
A graph representing the five number summary. The boxed area represents the IQR with the median at the center. |
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Frequency Distribution |
A table that sorts data into equally-sized classes. |
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Frequency |
The amount of data points that fall into each class. |
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Cumulative Frequency |
The running total of the frequencies. |
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Relative Frequency |
The frequency divided by the total number of data points. |
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Cumulative Relative Frequency |
The running total of the relative frequencies. |
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Histogram |
A frequency distribution shown in graph form. |
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Positive Skew (Right Skew) |
When values pull a chart to the right. The mean is greater than the median. |
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Negative Skew (Left Skew) |
When values pull a chart to the left. The mean is less than the median. |
