1. ## Confidence interval

I am not sure how to do question 11.
Should I use the margin of error formula at the 95% confidence. E=1✓n

Or should I use the standard error of the proportion formula. Standard deviation of proportion=✓[p(1-p)]/n

Which do I use and how are you supposed to know which to use?

2. ## Re: Confidence interval

Originally Posted by edwardkiely

I am not sure how to do question 11.
Should I use the margin of error formula at the 95% confidence. E=1✓n
Or should I use the standard error of the proportion formula. Standard deviation of proportion=✓[p(1-p)]/n
Which do I use and how are you supposed to know which to use?

3. ## Re: Confidence interval

You use the second of the methods you've listed.

I confess I'm unfamiliar with the first method.

4. ## Re: Confidence interval

how are you supposed to know which one to use do you know?

5. ## Re: Confidence interval

There is only one method that both romsek and I know...

Proportion: Confidence Interval