![]() We can also figure out the value of the quartiles through a formula for the lower quartile ( ): The first quartile is the middle value to the left of the median in the data set. Next we will find out both the first and the third quartiles. To find our Median we can also use the formula: Since n = 10 in this set thus, the median will not be explicit and so we will take the midpoint of the two middle values: We will then find the median in the data, which will require the formula that we studied in the previous chapter. Similarly for the smallest number we will look for the smallest number in the dataset, which in this case is 25. Then to find the maximum value we will find the largest number in the dataset which in this case is 38. We will first put the data in the order from the smallest number to the largest number. In order to draw a box plot we first need to find out the maximum, minimum, quartiles and the median. Provides indication of data’s symmetry and skewnessĪ sample of 1010 boxes of raisins has these weights (in grams):.We can study the shape of the data and discover the relation between mean, median and mode.Minimum, maximum, median, first quartile and third quartile, interquartile, upper limit and lower limit. Outlier can be present in the measurement, they thus need to be shown separately on the box and whiskers diagram.Ī box and whiskers diagram is also known as box plot, it displays a summary of a set of data.Maximum, Minimum, First Quartile, Third Quartile and Median, interquartile, upper limit, lower limit.A box and whiskers diagram displays a summary of a set of data.
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