Data Distribution - Histograms

Data Distribution - Histograms Histogram – a graph used to show data distribution in which the horizontal axis displays groups of data called bins and the vertical axis shows the frequency of the data in each bin

Data Distribution - Histograms Create a histogram for the following data representing the sales made by a salesperson per day for a month. 2 2 3 5 10 3 4 2 3 3 4 6 8 7 5 12 2 8 8 3 4 14 14 10 6 7 8 3 11 7

Data Distribution - Histograms Step 1 – The data will be broken into groups called bins so choose a bin size and the bins to use. For example a bin of 0 – 3 would represent the days where 0 – 3 sales were made. The smaller the bin size the more specific you can be about where the data is, but the more bins will result. 0 - 3 3 – 6 6 – 9 9 – 12 12 – 15

Data Distribution - Histograms Step 2 – Create a frequency table, using your bins, and determine how many values are in each bin. frequency 0 – 3 This is for all values from 0 up to but not including 3 3 - 6 This is for all values from 3 up to but not including 6 6 -9 9 -12 12- 15

Data Distribution - Histograms Step 2 – Create a frequency table, using your bins, and enter the data. frequency 0 – 3 This is for all values from 0 up to but not including 3 4 3 - 6 This is for all values from 3 up to but not including 6 11 6 -9 9 9 -12 3 12- 15 3 Step 3 – Draw the histogram

Frequency 0 3 6 9 12 15 Bins

Step 4 – Sometimes the mean and median are identified on the histogram with vertical lines.

median mean Frequency 0 3 6 9 12 15 Bins