Question 545383
400 people are asked a question in a poll and 80 said yes. 
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sample proportion = p-hat = 80/400 = 1/5
test statistic = ((1/5)-p)/sqrt[p*q/n] = ?
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What is the P-value?
The p-value is the probability that z is less than (or greater than)
the test statistic.  You don't have enough information to calculate
a p-value 
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Cheers,
Stan H.