Question 1178987
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Hi
c=0.98​, σ=9.1​, and E=2
Assume that a preliminary sample has at least 30 members: z(.98 CI) = 2.326
{{{z =blue (x - mu)/blue(sigma/sqrt(n)) = sqrt(n)(ME)/blue(sigma)}}}  OR  n = {{{(z*blue(sigma)/ME)^2}}}
 n = (2.326*9.1/2)^2 = 103.5  
minimum sample size n needed:  104

Wish You the Best in your Studies.
 = CI	z = value
90%	z =1.645
92%	z = 1.751
95%	z = 1.96
98%	z = 2.326
99%	z = 2.576

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