Question

Assume that the data has a normal distribution and the number of observations is greater than fifty. Find the critical z value used to test a null hypothesis.

Answer 1

Complete Question

The complete question is shown on the first uploaded image

Answer:

The value is  $z = \pm 1.645$

Step-by-step explanation:

From the question we are told that

   The number of observation is greater than 50  i.e. n > 50

   The  level of significance is  $\alpha = 0.1$

Generally given that n >  30  then we will make use of the z table  

So  

  From the z table the critical value corresponding to the level of significance level for a two-tailed test is

         $z = \pm 1.645$