Box and whisker plots

Box and whisker plot is a statistical measure to show the distribution of data. It is also called as Five Number Summary box as it consists of the median, the quartiles (lower and upper) and smallest and greatest values in distribution.

1. BOX AND WHISKER PLOTS Presented by- Dr Garima Gupta Post Graduate Resident University College of Medical Sciences and GTB Hospital

2. INTRODUCTION A Box-and-Whisker Plot shows the distribution of a set of data along a number line, dividing the data into four parts using the median and quartiles . It was introduced by John Tukey in 1969, Hence also known as Tukey Boxplot. It is also called as Five number summary box, as it consists of the median , the quartiles (lower quartile and upper quartile), and the smallest and greatest values in the distribution.

3. How to construct a Box And Whisker Plot For instance we have a data set of 15 values for HDL-Cholesterol 31 , 41, 44, 46, 47, 48, 49, 52, 53, 54, 57, 58, 60, 62, 65 (arranged in ascending order) Find the median of data 31, 41, 44, 46, 47, 48, 49, 52, 53, 54, 57, 58, 60, 62, 65 Median = Q2

4. Find the medians of the two halves 31, 41, 44, 46, 47, 48, 49, 52, 53, 54, 57, 58, 60, 62, 65 Lower Median / Q1 Upper Median / Q3

5. Draw a number line that extends far enough in both directions to include all the numbers in your data . (Vertically)

6. Thank You