The following data on power consumption in electricfurnace heats (kW consumed per ton of melted product)

resulted from a 24 factorial experiment with three replicates

(“Studies on a 10-cwt Arc Furnace,” J. of the Iron and Steel Institute, 1956: 22). The factors were nature of roof (A, low/high), power setting (B, low/high), scrap used (C, tube/plate), and charge (D, 700 lb/1000 lb).

Construct the ANOVA table, and test all hypotheses of interest using .