Comparing Two Populations

How Do You Find the Mean of a Data Set?

Mean is just another name for average. To find the mean of a data set, add all the values together and divide by the number of values in the set. The result is your mean! To see an example of finding the mean, watch this tutorial!
How Do You Find the Median of a Data Set?

The median of a data set is the number that is the middle value of the set. It's easy to find the median if you first put the numbers in order from least to greatest. In this tutorial, see how to find the median of a data set, and see what to do if there are two middle values!
How Do You Compare the Mean and Median of Data Sets Using a Line Plot

The mean and median can help you better understand a data set. Check out this real world example involving finding and comparing the mean and median of multiple data sets.
How Do You Compare Two Data Sets Using Box-and-Whisker Plots?