Using SAS and JMP to check if x
and y ~ N
Normal option generates
Shapiro Wilks Stats
Double click here
Shapiro Wilks
Stat for x, price
charged
Look at p value. If p value
>5% then likely that data
follows a normal distribution.
Do the same for y (here quantity
sold, SAS variable name Q)
Double click here
Again compare reported p
value to alpha of 5%. If
greater than 5% cannot
reject null that Q “follows a
normal distribution”.
In JMP
Open
table
I have exported
SAS workfile to
JMP
Click analyze
Select
distribution
Highlight P and Q
(the two variables
being correlated
in this problem)
Finish
selection by
clicking on
columns box
Stack diagrams
horizontally
Select
normal
Go to fit
distribution
Right click on
fitted normal
Select goodness of
fit
Will find same p values
found on SAS