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Statistics
| Term | Definition |
|---|---|
| qualitative | observations about data made by using your senses |
| quantitative | observations about data made by using tools |
| statistic | a piece of numerical data |
| statistical question | a question that can be answered by collecting quantitative data that will vary |
| variability | the measure of the spread of a data set |
| natural variability | differences that occur in a data set because of a natural system |
| measurement variability | differences that occur in a data set because of user error |
| sample variability | differences that occur in a data set because of a different sample or set |
| stem-and-leaf plot | a method to display the frequency of a value in a set of data |
| histogram | a method to display groups of data in a set of data |
| mean absolute variation | a method to display how far from the mean each data point (on average) is |
| 5-number summary | a method to display data points in a set used to create a boxplot |
| symmetrical | data that, when graphed, are evenly distributed around the mean |
| bimodal | data that, when graphed, have two clusters on each end of the graph |
| skewed | data that, when graphed, have one cluster at either end of the graph |
| spread | a method to display how far apart data points are in a set (measured by range) |
| dispersion | a method to display how far apart data points are is a set (also known as spread) |
| cluster | a group of data that is close together in a set of data |
| outlier | a data point in a set of data that is at least 1.5 times smaller than Q1 -OR- at least 1.5 times larger than Q3 |
| boxplot | a method to organize, summarize, and display data in a set of data |
| first quartile | a statistic in a boxplot describing the lowest portion of data (also known as Q1 or lower quartile) |
| third quartile | a statistic in a boxplot describing a portion of data (also known as Q3 or upper quartile) |
| interquartile range | a statistic in a boxplot describing the range between Q3 and Q1 (also known as IQR) |
| whiskers | data points in a boxplot that do not fall within the IQR (these are the minimum and maximum data points) |
| range | the difference between the largest and smallest data points in a set of data (this is the measure used to describe spread or dispersion) |
| average | the calculated central value of a set of data (also known as mean) |
| mean | the calculated central value of a set of data (also known as average) |
| median | the middle number in a data set that has been written in numerical order |
| centering point | the middle number in a data set that has been written in numerical order (also known as median) |
Created by:
lowers
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