This chart is used to show a statistical five-set number summary of the data. Box and Whisker plot is an exploratory chart used to show the distribution of the data. Q 3 = 3/4*(n+1)th value = 3/4*(8+1)th value = 6 3/4th value = 12 + 3/4 * (15-12) = 14 1/4. Box and Whisker Plot is used to show the numbers trend of the data set. This makes sense, the median is the average of the middle two numbers.Ħ. You can verify this number by using the QUARTILE.EXC function or looking at the box and whisker plot.ĥ. In this example, n = 8 (number of data points).Ĥ.
This function interpolates between two values to calculate a quartile. The Box and Whisker Plot Maker will generate a list of key measures and make a box plot chart to show the distribution. Enter your data as a string of numbers, separated by commas. For example, select the even number of data points below.Įxplanation: Excel uses the QUARTILE.EXC function to calculate the 1st quartile (Q 1), 2nd quartile (Q 2 or median) and 3rd quartile (Q 3). This Box and Whisker Plot Maker: Generates A Box and Whisker Plot Calculates Key Quartile Statistics Using The Box and Whisker Plot Maker. Most of the time, you can cannot easily determine the 1st quartile and 3rd quartile without performing calculations.ġ. Note: you dont have to sort the data points from smallest to largest, but it will help you understand the box and whisker plot. A box and whisker plot shows the minimum value, first quartile, median, third quartile and maximum value of a data set.
#Excel box and whisker plot how to
As a result, the whiskers extend to the minimum value (2) and maximum value (34). This example teaches you how to create a box and whisker plot in Excel. As a result, the top whisker extends to the largest value (18) within this range.Įxplanation: all data points are between -17.5 and 34.5. Therefore, in this example, 35 is considered an outlier. A data point is considered an outlier if it exceeds a distance of 1.5 times the IQR below the 1st quartile (Q 1 - 1.5 * IQR = 2 - 1.5 * 13 = -17.5) or 1.5 times the IQR above the 3rd quartile (Q 3 + 1.5 * IQR = 15 + 1.5 * 13 = 34.5). In this example, IQR = Q 3 - Q 1 = 15 - 2 = 13. Q 3 = 15.Įxplanation: the interquartile range (IQR) is defined as the distance between the 1st quartile and the 3rd quartile. The 3rd quartile (Q 3) is the median of the second half. The 1st quartile (Q 1) is the median of the first half. The median divides the data set into a bottom half. The x in the box represents the mean (also 8 in this example). On the Insert tab, in the Charts group, click the Statistic Chart symbol.Įxplanation: the middle line of the box represents the median or middle number (8).
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