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Statistics / Applied Statistics and Probability for Engineers 6 / Chapter 8.4 / Problem 61E

Applied Statistics and Probability for Engineers | 6th Edition | ISBN: 9781118539712 | Authors: Douglas C. Montgomery, George C. Runger

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The 2004 presidential election exit polls from the

Chapter 8, Problem 61E

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QUESTION:

The 2004 presidential election exit polls from the critical state of Ohio provided the following results. The exit polls had 2020 respondents, 768 of whom were college graduates. Of the college graduates, 412 voted for George Bush.

(a) Calculate a 95% confidence interval for the proportion of college graduates in Ohio who voted for George Bush.

(b) Calculate a 95% lower confidence bound for the proportion of college graduates in Ohio who voted for George Bush.

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QUESTION:

The 2004 presidential election exit polls from the critical state of Ohio provided the following results. The exit polls had 2020 respondents, 768 of whom were college graduates. Of the college graduates, 412 voted for George Bush.

(a) Calculate a 95% confidence interval for the proportion of college graduates in Ohio who voted for George Bush.

(b) Calculate a 95% lower confidence bound for the proportion of college graduates in Ohio who voted for George Bush.

ANSWER:

Step 1 of 4

Given,

Sample size,

The proportion of observations,

For a proportion of observations in a random sample of size n that belongs to a class of interest the Approximate Confidence Interval on a Binomial Proportion is,

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