Normal Probability Plot

To graph a Normal Probability plot for this problem we first enter the data into the calculator. I will use list 1.

After you have entered all the data Press: Y =

This will take you to the Lists Menu.

Clear any old data from the list as it may interfere with this new problem.

"1:Plot1..." should be highlighted.


Make sure On is highlighted

Press: (Note: the switch is moved to "On")

Arrow down and right to highlight the last Plot option.

For Data List I entered L1 as that is where I placed my data.
For Data Axis highlight X and press:

Next Press:

As you can see from the screen there is a noticeable curve.
(perhaps a cubic model would be appropriate here or a cube root transformation of the data)

It does not appear Normally Distributed.