Margin of Error, E = Z*
At 99% confidence level, Z* = 2.576
n = Sample size
Since there is no prior estimate of population proportion, p, let us assume that p = 0.5
Given E = 0.05
Therefore, 0.05 = 2.576 x
= 25.76
n = 664 (rounded up)
Sample size required, n = 664
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