Need help with a probability and statistics question about a telephone poll

Statistics
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A telephone poll of 1,000 adult Americans was reported in an issue of Time Magazine. One of the questions asked was "What is the main problem facing the country?" Twenty percent answered "crime." We are interested in the population proportion of adult Americans who feel that crime is the main problem.

find the 95 percent confidence interval and the error bound

Nov 3rd, 2015

Thank you for the opportunity to help you with your question!

We have

X=number of American who polled that answered that crime was the problem facing the country.

The proportion of population=Mean=p=0.2

The q=1-p=0.8

Here n=1000

Standard deviation=

The critical value for the 95% confidence interval is 1.96

Lower bound=

(answer)

Upper bound=>

(answer)

Thus the 95% confidence interval is [.175,.225]

Error bound=Upper bound-Mean=>.225-.2 =.025(answer)





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Nov 3rd, 2015

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