Find the critical value za/2 that corresponds to a 82% confidence level.

Finding critical value of Z at 82% confidence level:

Step 1: α% = 100%-82% = 18%

Step 2: α = 18% = 0.18

Step 3: α/2 = 0.18/2 = 0.09

Step 4: 1 - α/2 = 1-0.09 = 0.91

Step 5: Critical value of Z at 82%confidence level = Z at 0.91 (from Z tables) ≈ 1.34