A chemist would like a margin of error for his experiment on chemical viscosity to be no more than 0.6217. How large a sample must he use if σ = 0.858 and he would like to have a 95% confidence level?
Margin of error=z(alpha/2)*sigma/srqt(n)
It is given that ME should not be more than 0.6217
z(alpha/2)*sigma/srqt(n) ≤0.6217
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