Step 1 :Margin of Error = Z * (sqrt((p-hat * (1-p-hat))/n))
Step 2 :Z = 1.645 (for a 90% confidence level)
Step 3 :p-hat = 0.8
Step 4 :n = 600
Step 5 :Margin of Error = 1.645 * (sqrt((0.8 * (1-0.8))/600))
Step 6 :Margin of Error = 1.645 * (sqrt(0.16/600))
Step 7 :Margin of Error = 1.645 * (sqrt(0.0002667))
Step 8 :Margin of Error = 1.645 * 0.01633
Step 9 :Margin of Error ≈ 0.0269