A researcher claims that more than 80% of American adults believe in an afterlife.
Favorites|Homepage
Subscriptions | sitemap
HOME > > A researcher claims that more than 80% of American adults believe in an afterlife.

A researcher claims that more than 80% of American adults believe in an afterlife.

[From: ] [author: ] [Date: 12-05-27] [Hit: ]
Var = 489.6 * 0.2 = 97.Std = sqrt(97.92) = 9.Z = (489.......
A researcher claims that more than 80% of American adults believe in an afterlife. You randomly select 612 adults and find that 459 of them believe in an afterlife. At the 1% significance level, can you conclude that more than 80% of adults believe in an afterlife?

-
Normal approximation (i.e., Z-table test) on the Binomial Distribution.

Mean = 612 * 0.80 = 489.6
Var = 489.6 * 0.2 = 97.92
Std = sqrt(97.92) = 9.90

Z = (489.6 - 459) / 9.9 = 3.09 > 2.58

reject null hypothesis at 1% significance level.
1
keywords: adults,researcher,of,that,believe,than,more,American,80%,in,claims,an,afterlife,A researcher claims that more than 80% of American adults believe in an afterlife.
New
Hot
© 2008-2010 http://www.science-mathematics.com . Program by zplan cms. Theme by wukong .