document.write( "Question 687594: In a poll to estimate presidential popularity, each person in a random sample of 800 voters was asked to agree with one of the following statements: 1. The president is doing a good job. 2. The president is doing a poor job. 3. I have no opinion. A total of 500 respondents selected the first statement, indicating they thought the president was doing a good job. (a) Construct a 98% confidence interval for the proportion of respondents who feel the president is doing a job. (Round your answers to 2 decimal places.) \n" ); document.write( "

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In a poll to estimate presidential popularity, each person in a random sample of 800 voters was asked to agree with one of the following statements: 1. The president is doing a good job. 2. The president is doing a poor job. 3. I have no opinion. A total of 500 respondents selected the first statement, indicating they thought the president was doing a good job. (a) Construct a 98% confidence interval for the proportion of respondents who feel the president is doing a job.
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\n" ); document.write( "p-hat = 5/8
\n" ); document.write( "ME = 2.3263*sqrt[(5/8)(3/8)/800] = 0.0398
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\n" ); document.write( "98%CI: (5/8)-0.0398 < p < (5/8)+0.0398
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\n" ); document.write( "Cheers,
\n" ); document.write( "Stan H.
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