Margin of error question

Question

According to a national poll of 425 college students, 61% 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 ____________%

The 95% confidence interval is from ____________% to ____________%.

Answer 1

Margin of error

 

1.96 x sqrt(.61*.39/425) = .0463 = 4.6%

 

95% CI = 61% plus or minus 4.6% =    56.4% to 65.6%