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QUESTION PART A: Express the confidence interval 23.1% <p< 30.9% 23.1% <p< 30.9% in the form...

QUESTION PART A: Express the confidence interval 23.1% <p< 30.9% 23.1% <p< 30.9% in the form of ˆp±ME.

_____% ±____ %

QUESTION PART B: A political candidate has asked you to conduct a poll to determine what percentage of people support her.

If the candidate only wants a 10% margin of error at a 95% confidence level, what size of sample is needed?

Give your answer in whole people.

QUESTION PART C: A political candidate has asked you to conduct a poll to determine what percentage of people support her.

If the candidate only wants a 6% margin of error at a 95% confidence level, what is the sample size that is needed?

Give your answer as a whole number.

Math   Statistics-And-Probability   
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Solution:

QUESTION PART A: Express the confidence interval 23.1% <p< 30.9% in the form of ˆp±ME.

Therefore, we have:

QUESTION PART B: A political candidate has asked you to conduct a poll to determine what percentage of people support her.

If the candidate only wants a 10% margin of error at a 95% confidence level, what size of sample is needed?

QUESTION PART C: A political candidate has asked you to conduct a poll to determine what percentage of people support her.

If the candidate only wants a 6% margin of error at a 95% confidence level, what is the sample size that is needed?

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