Question 1082716
interval is e=0.02=1.645*SE, SE=sqrt(.42*.58/n)
square both sides
0.0004=2.706*(.42*58/n)
0.0004n=0.6592
n=1647.95 or 1648
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use 0.5 and sqrt term is 0.25/n
0.0004=2.706*.25=0.6765
1691.25 or 1692.