The Professor's Response
Hi professor
For the small, independent samples with unequal variances, (welch-satterthwaite method), if the n's are the same, is it ok to use the formula: (n1+n2-2) for the degrees of freedom?
Thank you
See the professor's answer below.
Hi Shirley,
Yes, as long as the sample sizes are same you can use the shortcut of n1 + n2 -2 for the degrees of freedom.
If that occurs on the exam, you will use the shortcut whenever the sample sizes are the same.
Sincerely,
Professor McGuckian