# Probability paper

1. Nov 14, 2008

### axnman

Jus some confusion over plotting points on normal probability paper..

1. Order the data
2. Do we do (i-0.5)/n where i=no. of observation and n= no. of samples?
believe can't use Z(i)= (X(i)- Mean)/ stand. dev. as i need to find both mean and std. dev from the graph...
What is the graph plotted for...i mean i have X(i) Vs Z(i) but seem a bit in circles.

can anybody please let me know?thanks

2. Nov 14, 2008

### HallsofIvy

Staff Emeritus
Okay, that should be easy.

Do that for WHAT? I have no idea what you are taking about here.