5. The article Origin of Precambrian Iron Formations

(Econ. Geol., 1964: 1025—1057) reports the following data on total Fe for four types of iron formation

(1  carbonate, 2  silicate, 3  magnetite, 4  hematite).

1: 20.5 28.1 27.8 27.0 28.0 25.2 25.3 27.1 20.5 31.3 2: 26.3 24.0 26.2 20.2 23.7 34.0 17.1 26.8 23.7 24.9 3: 29.5 34.0 27.5 29.4 27.9 26.2 29.9 29.5 30.0 35.6 4: 36.5 44.2 34.1 30.3 31.4 33.1 34.1 32.9 36.3 25.5 Carry out an analysis of variance F test at signicance level .01, and summarize the results in an ANOVA table.