Solutions Statistics

An experiment was carried out to investigate the effect of four different moulds and three different

Question: An experiment was carried out to investigate the effect of four different moulds and three different melt compositions on the carbon content of steel. Three different test pieces were selected at random from the ingots cast in each mould. The data are presented below.

		Melt
Mould	A	B	C
1	22.0	17.6	26.2
1	23.7	17.0	24.2
1	21.2	17.8	25.5
2	21.6	17.2	28.3
2	22.6	18.5	28.4
2	21.9	17.3	30.6
3	20.7	12.3	24.2
3	20.5	11.7	22.8
3	20.2	11.6	26.3
4	23.8	22.3	30.2
4	24.7	22.7	30.4
4	23.0	21.2	30.6

Means	22.16	17.27	27.31