crossingtheDE
New member
- Joined
- Feb 18, 2008
- Messages
- 1
Okay, so this is the question I was given.
"A May 2005 Gallup Poll found that 38% of a random sample of 1012 adults said that they believe in ghosts. Find the margin of error for this poll if we want 90% confidence in our estimate of the number of Americans who believe in ghosts."
The formula I have for margin of error is m = z*(st. dev. / n^.5), so I'm really lost because I don't see any standard deviation given in the problem. Any help or suggestions would be amazing.
"A May 2005 Gallup Poll found that 38% of a random sample of 1012 adults said that they believe in ghosts. Find the margin of error for this poll if we want 90% confidence in our estimate of the number of Americans who believe in ghosts."
The formula I have for margin of error is m = z*(st. dev. / n^.5), so I'm really lost because I don't see any standard deviation given in the problem. Any help or suggestions would be amazing.