Finding z, Use Table A or technology to find the critical value z* for a 99.9% confidence interval.

Question

Finding z, Use Table A or technology to find the critical value z* for a 99.9% confidence interval.

{A} 3.339

{B} 2.392

{C} 3.291

{D} none of the above

Answer 1

Apha = 1-0.999 = 0.001

Apha/2 = 0.0005 check in z table corresponding probability

Zc = Z (1- alpha/2) = 3.291

So the answer for this question is option C