Economic Statistics Question... someone please!!!?

Question

I have already calculated the t-value for correlation between two numbers. Now, I have to find the number corresponding to my 146 degrees of freedom, but the t-value chart skips a bunch of df:s between 140 and 160. What do I do?

Answer 1

with so many degrees of freedom the difference between the t and the standard normal is neglegable.  but if you are using the table from 140 degrees of freedom you'll be correct up to two decimal places.

the other option would be to use software to get the exact values.  I use the software program R for my stats work.  you can get if for free form www.r-project.org under GNU licenses.

Answer 2

use tdist() functiuon in excel, or interpolate between the two values, or take the one for 140.