Question
Asked Nov 12, 2019
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I need help finding the answer on the TI84 Plus CE and on paper ?. Thank you

A political candidate has asked you to conduct a poll to determine what percentage of
people support him. If the candidate only wants a 10% margin of error at a 90%
confidence level, what size of sample is needed?
Hint: Video []
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A political candidate has asked you to conduct a poll to determine what percentage of people support him. If the candidate only wants a 10% margin of error at a 90% confidence level, what size of sample is needed? Hint: Video []

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Expert Answer

Step 1

It is given that margin of error (E) is 0.10 and the confidence level is 90%.

Step 2

Here,

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a 1-0.90 = 0.10 0.10 2 =0.05 0.05 2 1.645 Using standard normal table

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Step 3

In this case, as there is no any estimates available, the sample proportion is assumed to be ...

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(2(1-p)) E 2 1.645 (0.5x (1-0.5)) 0.10

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