The following data on power consumption in electric furnace heats (kW consumed per ton of melted product) resulted from a 2^4 factorial experiment with three replicates. The factors were nature of roof (A, low/high), power setting (B, low/high), scrap used (C, tube/plate), and charge (D, 700 lb/1000lb).
Treatment x_ijklm | Treatment x_ijklm
(1) 865, 861, 799 | d 991, 808, 650
a 946, 800, 840 | ad 966, 976, 876
b 776, 834, 746 | bd 702, 659, 650
ab 709, 789, 646 | abd 784, 700, 597
c 1017, 990, 954 | cd 922, 808, 868
ac 1028, 906, 977 | acd 1055, 870, 907
bc 817, 783, 771 | bcd 798, 728, 700
abc 829, 806, 691 | abcd 753, 713, 715