Question 866340
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Hi
{{{3 = 1.96(42/sqrt(n))}}}
 {{{n = (1.96*42/3)^2}}} = 752.9536,  753  Students

CI	z -value
90%	z =1.645
92%	z = 1.751
95%	z = 1.96
98%	z = 2.326
99%	z = 2.576