Stratum

Population

Sample Size

Food Sector

N 1 = 895

N 1 n / N = n 1 = 35

Construction Sector

N 2 = 400

N 2 n / N = n 2 = 16

Metal Sector

N 3 = 750

N 3 n / N = n 3 = 30

Wood Sector

N 4 = 350

N 4 n / N = n 4 = 14