<PRE><B>Question 872600</B>
ME = z*s/sqrt(n)



ME*sqrt(n) = z*s



sqrt(n) = z*s/ME



n = (z*s/ME)^2



n = (2.576*1000/1600)^2 ... z = 2.576 is found using a table (critical value for 99% confidence interval)



n = 2.5921



n = 3 ... round UP to the nearest whole number



The min sample size is 3
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