Question 1168753
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At 90% confidence, the z critical value is about z = 1.645; this value you'll need to look up in a table found in the back of your book. You can also use a calculator.


phat = sample proportion
phat = x/n
phat = 110/360
phat = 0.30556


E = margin of error
E = z*sqrt(phat*(1-phat)/n)
E = 1.645*sqrt(0.30556*(1-0.30556)/360)
E = 0.039937
E = 0.0399
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