Statistics help Plz, Calculate an interpret a 95% CI....
Favorites|Homepage
Subscriptions | sitemap
HOME > > Statistics help Plz, Calculate an interpret a 95% CI....

Statistics help Plz, Calculate an interpret a 95% CI....

[From: ] [author: ] [Date: 13-10-23] [Hit: ]
56)(1 -0.CI = (0.539, 0.......
An April 2009 survey of 2253 American adults conducted by the Pew
Research Center's Internet & American Life Project revealed that 1262 of
the respondents had at some point used wireless means for online access.

Calculate an interpret a 95% CI for the proportion of all American
adults who at the time of the survey had used wireless means for
online access.

Answer = (0.539, 0.581)

I know the answer but how did they get this can some one show me the steps?
Thanks.

-
keepsmiling

CI = p̂ ± (z*)√[( p̂)(1 - p̂) / n]

p̂ = 1262/ 2253 = 0.56
z* = 1.96 from Standard Normal table with 5%/2 = 0.025 area in each tail

CI = 0.56 ± (1.96)√[( 0.56)(1 - 0.56) / 2253]

CI = (0.539, 0.581)

hope that helped
1
keywords: Statistics,an,CI,95%,Plz,Calculate,help,interpret,Statistics help Plz, Calculate an interpret a 95% CI....
New
Hot
© 2008-2010 http://www.science-mathematics.com . Program by zplan cms. Theme by wukong .