Question

For a confidence level of 85%, find the critical value for a normally distributed variable. The sample mean is normally distributed if the population standard deviation is known.

Answer 1

Answer:

The  value is  $Z_{\alpha } = 1.439$

Step-by-step explanation:

From the question we are told that

   The  confidence level is  C  =  85%  

Generally the level of significance is mathematically represented as

         $\alpha = (100 - 85 )\%$

        $\alpha = 0.15$

Now from the normal distribution table  the critical value  of $\alpha$ is  

     $Z_{\alpha } = 1.439$