Estimating, CI's and testing: When do you add √{ (N-n)/(N-1) } to the formula?

Hello,

I'm new to this forum. It seems helpful! I hope I can contribute some myself as well.

But now, I'd be very glad if you could help me with my Statistics test preparation. The test will be about estimating, confidence intervals and hypothesis testing.

My question is when to use what formula (see picture). I don't understand in what case I have to add in √{ (N-n)/(N-1) } to the formula, and when I don't, for estimating, CI's and testing.

This is how it's stated on my formula paper:

http://img15.imageshack.us/img15/7224/vraag1c.png

Thanks in advance.

Re: Estimating, CI's and testing: When do you add √{ (N-n)/(N-1) } to the formula?

Hey japzer7.

This looks like the formulas for when you have a finite population.

When the population is not infinite you take a limit when N -> infinity and the term will equal 1 which gives you the normal results.