PLEASE HELP!

What is the margin of error for a yes/no survey of 200 people with a proportion of 65% who answered "yes"?

Question

PLEASE HELP!

What is the margin of error for a yes/no survey of 200 people with a proportion of 65% who answered "yes"?

anonymous · Answer

You don't know how to do proportions  is tht ur problem???

anonymous · Answer

im just confused on everything lol, like i dont even understand were to start

mertsj · Answer

There is a formula for margin of error.  Do you have it?

anonymous · Answer

attachment

anonymous · Answer

is that it?

mertsj · Answer

It looks like it.  I have found others online.

mertsj · Answer

http://www.ehow.com/how_5276026_compute-margin-error-easy-methods.html

anonymous · Answer

how would i plug the numbers in?

mertsj · Answer

Where ever you got that formula should tell you what the variables represent.

anonymous · Answer

i got 10.1? does that seem right?

mertsj · Answer

MOE = (1.96)sqrt[p(1-p)/(n)]

mertsj · Answer

$$MOE=1.96\sqrt{\frac{p(p-1)}{n}}=1.96\sqrt{\frac{.65(1-.65)}{200}}=.066=6.6%$$

mertsj · Answer

6.6%

anonymous · Answer

wow your good at this lol

anonymous · Answer

thank you so much (:

mertsj · Answer

Not really.  I just looked up the formula on the internet and plugged in the numbers.  Actually, I've never done it before.  Do you have a way to check the answer?