# A political candidate has asked you to conduct a poll to determine what percentage of people...

A political candidate has asked you to conduct a poll to determine what percentage of people support her. If the candidate only wants a 4% margin of error at a 95% confidence level, what size of sample is needed? Hint: Textbook Video [+]

Given that:-

margin of error = E = 4% = 0.04

At 95% confidence level the Z is,

sample size

=600.25

Sample size = n = 600

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