Calculate the z critical value with the help of the given significance level.
Significance level = 0.06
Step 1: First of all, calculate half of the given significance level (α)
α/2 = 0.06/2 = 0.03
Step 2: Now subtract the above value from 1.
1 - α/2 = 1 – 0.03 = 0.97
Step 3: Now take a z distribution table and search the above value in the table.
Step 4: After indicating the value on the z distribution table, take its corresponding degree of freedom and significance level and add them.
Df = 1.8
Significance level = 0.08
z critical value = 1.8 + 0.08
z critical value = 1.88