Question

Stats Compute the critical value za/2 that corresponds to 91 % level confidence

Answer 1

We have to express the critical value of z for a 91% confidence level.

We have to consider that it consider to have two tails.

We can express it as:

$P(z<|z_{\alpha\/2}|)=0.91$

We can use a table or app to find it:

This value is z = 1.6954.

Answer: z = 1.70