statshelp

04-09-2008, 11:55 AM

If you know the length of a confidence interval for a proportion, How would you find the margin of error?

Please Help!

Please Help!

View Full Version : confidence int. length known for prop.: how to find margin?

statshelp

04-09-2008, 11:55 AM

If you know the length of a confidence interval for a proportion, How would you find the margin of error?

Please Help!

Please Help!

royhaas

04-09-2008, 12:32 PM

How do you calculate the length of a confidence interval?

statshelp

04-09-2008, 12:47 PM

Max confidence interval - Min confidence interval / 2

royhaas

04-09-2008, 01:05 PM

No, the length is just the difference between the two endpoints of the interval. Now use the formulas for those endpoints and subtract them.

statshelp

04-09-2008, 01:16 PM

Ok so once I find the length, I then divide by 2, to find the margin of error?

royhaas

04-09-2008, 01:18 PM

Just like the calculation implies.

statshelp

04-09-2008, 04:17 PM

Thanks, it just seemed to easy.

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