highly significantp < 0.01
Effect of Independent Variables on Enzyme Activity (EA) and Biomass (BM) The positive linear effects of X 1 (κ-carrageenan) and X 3 (yeast extract) on EA were found to be highly significant ( p < 0.01), and the effects of X 2 (NaCl) and X 4 (FOS) were significant ( p < 0.05), which agrees with the conclusion of the PB analysis.