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A political candidate has asked you to conduct a poll to determine what percentage of people support her. If thecandidate only wants a 1.5% margin of error at a 99% confidence level, what size of sample is needed?

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A political candidate has asked you to conduct a poll to determine what percentage of people support her. If the
candidate only wants a 1.5% margin of error at a 99% confidence level, what size of sample is needed?
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A political candidate has asked you to conduct a poll to determine what percentage of people support her. If the candidate only wants a 1.5% margin of error at a 99% confidence level, what size of sample is needed?

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Step 1

Here, there is no information about the population parameter. Hence, use the con...

Z
n =i
ME P(1-p)
2
From the standard normal table,
2.5760.5(1-0.5)the value of z* for 99% confidence in 2.576
0.015
- 7,373.08
7,374
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Z n =i ME P(1-p) 2 From the standard normal table, 2.5760.5(1-0.5)the value of z* for 99% confidence in 2.576 0.015 - 7,373.08 7,374

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