Question
In: Statistics and Probability
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 5% margin of error at a 95%
confidence level, what size of sample is needed?
Solutions
Expert Solution
Sample size estimation for proportion
Preliminary estimate for proportion (Unknown) = 0.5
Margin of error =E=0.05
Level of significance =1-0.95=0.05
Z critical value is (by using Z table)=1.96
Sample size
=384.15
Therefore, sample size approximately will be 385
orchestra answered 2 years agoRelated Solutions
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