Example 3

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Example for two-factor ANOVA

Lab N of strain	Species	CO2	Tea_Tree_Diffusion
1580	1	1	21.01
635	1	2	11.61
1298	1	2	13.83
1295	1	1	20.89
1299	1	1	13.11
1690	1	1	13.39
1307	1	1	17.00
1689	1	1	15.97
1050	1	2	16.80
1496	1	2	11.65
1681	1	2	14.31
801	1	2	16.27
1714	2	1	6.78
626	2	1	9.98
1692	2	1	11.19
1690	2	1	13.56
751	2	1	11.22
1682	2	1	8.91
724	2	2	10.62
723	2	2	14.43
1681	2	2	10.99
799	2	2	13.29
801	2	2	11.45
1576	2	2	11.76
924	3	1	19.52
348	3	1	31.44
244	3	1	26.61
1562	3	1	25.37
378	3	1	22.85
456	3	1	24.42
375	3	2	25.63
288	3	2	23.54
397	3	2	20.07
1211	3	2	22.53
134	3	2	16.96
1678	3	2	24.49

The table contains values of diameters of inhibition zones around paper disks containing tea tree oil against 3 species of bacteria (marked as '1', '2' and '3', including 12 strains of each species) grown in two types of atmospheric environment (column 'CO₂' type '1' and type '2').

For the variable 'Species' value '1' means E. coli, '2' – E. faecalis and '3' – S. aureus; for the variable 'CO₂' value '1' means normal atmosphere and '2' – atmosphere with increased concentration of CO₂. 

This example discussed in Two-factor ANOVA.

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