Press the Random sample button until you find a graph that you wish to guess the mean and
median of. Can you find a graph that appears "skewed-right" or "skewed-left"? Can you
find one with a more even distribution?
Check the "Guess" boxes next to "Mean" and "Median."
Move the lines to where you think mean and median belong on the distribution.( Note: The mean is red and the median is blue.) Think about whether the mean will be to the left or the right of the
Now check the "Actual" boxes next to "Mean" and "Median."
How close was your guess?
Uncheck "Actual" next to "Mean" and "Median" and try again! Try different looking
graphs. How close can you get to the actual value? Do you notice a relationship
between the shape of the graph and where the mean and median are located?
Click on the largest observation and move it to the right. HOw do the mean and median change?
Data can be pasted in with or without a variable name (header row). If using variable names, don't use nonalpha characters and don't include spaces in the variable names.
Stacked data can be input to compare groups. Make sure format matches (explanatory, response) button. Better to use chateracters, not numbers, for group labels.
Guess lines can be moved with the mouse.
Boxplot outliers are computed using the 1.5IQR rule
Points can be selected in the graph by clicking on them, and once selected, can be deleted or moved with the mouse.
Random samples can be selected with varying sample sizes. Data are generated from normal, mixture of two normals, uniform, and chi-square distributions.