I.A ime: 35:21:55 6D Homework Help Table Textbook Examples Ex 4-5 (p. 399-400) (

Question

I.A ime: 35:21:55 6D Homework Help Table Textbook Examples Ex 4-5 (p. 399-400) (25-32) Margin of error and According to a national poll of 700 college students, 53% play video games more than 6 hours a week. Find the margin of error and the 95% confidence interval for the survey. Give your answers as percentages rounded to the nearest tenth of a percent. The margin of error is | Number % The 95% confidence interval is from Number | % to Number 1 %. During the summer and fall of 2002, the United States was in the middle of an intense debate on the pros and cons of invading Iraq. Given the following survey details, would it have been safe to say, atkpe time, that majority of Americans favor attacking Iraq to oust Saddam Hussein" was done August 23, 2002; the sample size was 815, those who support-53%, those who oppose-41%; margin of error-3.5% ?Yes O No Next

Explanation / Answer

n =700 , p = 0.53
z value at 95% = 1.96
ME = z * sqrt( p * ( 1 -p)/n)
= 1.96 * sqrt( 0.53 * ( 1-0.53)/700)
= 0.037 = 3.7%

CI = p +/- ME
= 0.53 +/- 0.037
= (0.493,0.567)

The 95% CI is from 49.3% to 56.7%

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