The required sample size is equal to 273.
We have given that,
A political candidate has asked you to conduct a poll to determine what percentage of people support her.
We have to determine the If the candidate only wants an 8% margin of error at a 99% confidence level,
p=0.5 (default since no value is given)
q=1-0.5=0.5
margin of error=5%=0.05
z_c=1.65 at 90% confidence.
The margin of error:
[tex]e= sqrt(p(1-p)/n)*z_c[/tex]
Use the given value in the above formula we get,
0.05=sqrt(0.5*0.5/n)*1.65
n= (0.5*1.65/0.05)^2=272.25
Therefore, The required sample size is equal to 273.
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