**Find a critical z for a alpha a equals 0.1 significance level test of the claim**

**Answer:**

Given alpha = 0.1, critical z values for alpha=0.1 is

For two tailed alternative hypothesis, critical z=1.645

For two tailed, the area at the both tails will sum to 0.1 means we have to find z values such that area at each will be 0.05.