Ans.
a) p = x/n = 247/400 = 0.6175
b) SE = [p*(1-p)/n]^0.5 = [0.6175*(1-0.6175)/400]^0.5 = 0.0243
c) z = 1.96 (from z-table)
d) Margin of error = z*SE = 1.96*0.0243 = 0.04762
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Suppose that a simple random sample of size n = 400 selected from a population has...
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