Question 930151
Use the formula n = ( (z*sigma)/E )^2


where in this case


n = unknown
z = 2.576 (found using a calculator; based off the 99% confidence interval)
sigma = 9
E = 2


So,


n = ( (z*sigma)/E )^2


n = ( (2.576*9)/2 )^2


n = 134.374464


n = 135 ... round UP to the nearest whole number



Min Sample Size is n = 135


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