Question

Solving for sample size with given margin of error $frac{alpha}{2} = frac{1 - CL}{2}$ $z_{frac{alpha}{2}} = ext{invNormal} left( 1 - frac{alpha}{2} ight)$ $EBM = z_{frac{alpha}{2}} sqrt{frac{p'q'}{n}}$ A political candidate has asked his/her assistant to conduct a poll to determine the percentage of people in the community that supports him/her. If the candidate wants a 10% margin of error at a 90% confidence level, what size of sample is needed? Be sure to round accordingly. $cdot$ Find $frac{alpha}{2} = $ $cdot$ Find $z_{frac{alpha}{2}} = $ Round to 2 decimal places. $cdot$ Since we are not given any information about the population proportion, we are going to guess the value of $p' = $ $cdot$ Using the EMB formul to solve for $n = left( frac{z_{frac{alpha}{2}}}{EBM} ight)^2 p'q'$. Make sure to round UP to a whole number answer. The candidate would need to survey people in the community in order to be within a 10% margin of error at a 90% confidence level.

          Solving for sample size with given margin of error
$frac{alpha}{2} = frac{1 - CL}{2}$
$z_{frac{alpha}{2}} = 	ext{invNormal} left( 1 - frac{alpha}{2} 
ight)$
$EBM = z_{frac{alpha}{2}} sqrt{frac{p'q'}{n}}$
A political candidate has asked his/her assistant to conduct a poll to determine the percentage of people in
the community that supports him/her. If the candidate wants a 10% margin of error at a 90% confidence
level, what size of sample is needed? Be sure to round accordingly.
$cdot$ Find $frac{alpha}{2} = $
$cdot$ Find $z_{frac{alpha}{2}} = $
Round to 2 decimal places.
$cdot$ Since we are not given any information about the population proportion, we are going to guess the
value of $p' = $
$cdot$ Using the EMB formul to solve for $n = left( frac{z_{frac{alpha}{2}}}{EBM} 
ight)^2 p'q'$. Make sure to round UP to a whole number
answer.
The candidate would need to survey people in the community in order to be within a 10%
margin of error at a 90% confidence level.

$Solving for sample size with given margin of error fracalpha2 = frac1 - CL2 zfracalpha2 = extinvNormal left( 1 - fracalpha2 ight) EBM = zfracalpha2 sqrtfracp'q'n A political candidate has asked his/her assistant to conduct a poll to determine the percentage of people in the community that supports him/her. If the candidate wants a 10% margin of error at a 90% confidence level, what size of sample is needed? Be sure to round accordingly. cdot Find fracalpha2 = cdot Find zfracalpha2 = Round to 2 decimal places. cdot Since we are not given any information about the population proportion, we are going to guess the value of p' = cdot Using the EMB formul to solve for n = left( fraczfracalpha2EBM ight)^2 p'q'. Make sure to round UP to a whole number answer. The candidate would need to survey people in the community in order to be within a 10% margin of error at a 90% confidence level.$

Added by Andrea M.

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