Observed N

Expected N

Residual

E. coli

315

117.3

197.7

Enterobacter sp.

276

117.3

158.7

K. oxytoca

101

117.3

−16.3

K. pneumoniae

40

117.3

−77.3

Proteus vulgaris

40

117.3

−77.3

C. freundii

39

117.3

−78.3

No Growth

10

117.3

−107.3

Total

821