![]() The IQR illustrates the variability in a set of values. The median of the values is depicted as a line splitting the box in half. The box portion of the diagram below illustrates the middle 50 percent of the data values, also known as the interquartile range (IQR). Quartiles are a method of splitting numeric values into four equal groups based on five key values: minimum, first quartile, median, third quartile, and maximum. When the greater values are more spread out, the data are skewed to the right.Box plots allow you to visualize and compare the distribution and central tendency of numeric values through their quartiles. Skewed used to describe data that is not symmetrical when the right side of a graph looks “chopped off” compared the left side, we say it is “skewed to the left.” When the left side of the graph looks “chopped off” compared to the right side, we say the data is “skewed to the right.” Alternatively: when the lower values of the data are more spread out, we say the data are skewed to the left. each data point in one data set is matched with exactly one point from the other set.Glossary Box plot a graph that gives a quick picture of the middle 50% of the data First Quartile the value that is the median of the of the lower half of the ordered data set Frequency Polygon looks like a line graph but uses intervals to display ranges of large amounts of data Interval also called a class interval an interval represents a range of data and is used when displaying large data sets Paired Data Set two data sets that have a one to one relationship so that: Since 25% of values fall between 31 and 38, we know that fewer than 25% fall between 31 and 35. ![]() Twenty-five percent of the values fall in the interval 38 to 41, and 25% fall between 41 and 64.
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