The following table shows the mean number of colonies per plate obtainable by four slightly different methods from soil samples taken at 4 P.M. and 8 P.M. respectively: Method A Method B Method C Method D 4 P.M. 29-75 27-50 30-25 27-80 8 P.M. 39-20 40-60 36-20 42-40 Are there significantly more bacteria at 8 P.M. than at 4 P.M.

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