ga political candidate has asked you to conduct a poll to determine what percentage of people support her. if the candidate only wants a 8% margin of error at a 95% cnofidence level, what size of sample is needed

151

Step-by-step explanation:

if prior population proportion is unknown , then the formula is used to find the sample size :

, where = Two tailed critical value for significance level of

E = Margin of error.

Given : margin of error = 8%= .08

For 95% confidence level , two tailed critical value = 1.96

Now, the required sample size :

Hence, the size of the sample needed = 151.

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