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assume that a random sample is used to esitmate a population proportion p. find the margin of error e that corresponds to the given statistics and confidence level

 

n=550   x=440 90% confidence 

math statistics
 Aug 7, 2015

Best Answer 

 #1
avatar+21586 
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I believe that you also need to know the standard deviation of the population (at least the standard deviation of the sample) in order to do the calculation:

Formula:  E  =  zα/2 · σ / √n

where:  z represents the z-score when α = .90, σ represents the standard deviation, and n represents the number in the sample.

 Aug 7, 2015
 #1
avatar+21586 
+5
Best Answer

I believe that you also need to know the standard deviation of the population (at least the standard deviation of the sample) in order to do the calculation:

Formula:  E  =  zα/2 · σ / √n

where:  z represents the z-score when α = .90, σ represents the standard deviation, and n represents the number in the sample.

geno3141 Aug 7, 2015

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