# Red normal distribution overlay on student t-distribution is whack

sauls.jet shared this problem 2 years ago
Not a Problem

The little red curve button that you can click while looking at the preloaded probability distributions in geogebra classic probability world was, I thought, so that you could compare whatever you were looking at to a normal distribution. When you're working on the student distribution, it does something different. I think what's happening is its overlaying a normal distribution with a standard deviation that is not 1. I think this because the standard normal overlayed the student should always peak higher and have less weighted tails. The opposite is true in the picture. This makes the comparison not really useful

1

Your deduction is correct. If you look at the top left of the screen, you should see the summary statistics (mean and s.d.) for the distribution you have selected - in your case, this is mu=0 and sigma=1.1339. This is the normal distribution that is overlaid in your diagram.

To achieve what you want to achieve, you would need to Copy to Graphics View, then also create g(x)=Normal(0,1,x)

1

I see. Thanks for that work-around.