• Question: Does water temperature affect the weight of fish?

  • Experiment: Recently hatched specimens of fish are randomly divided into four groups. The fish are placed in separate simulated environments differing only in the temperature of the water.

  • Data: Weight of the fish after six months. 

    
          38 F   Rank   42 F   Rank   46 F   Rank   50 F   Rank
          -----------------------------------------------------
          16.8     2    17.0     3    19.4    10    15.7     1
          18.9     8    18.0     6    20.2    12    17.5     4
          20.0    11    18.5     7    22.6    18    17.8     5
          21.2    15    21.1    14    23.4    20    19.2     9
          22.1    17    21.6    16    23.9    21    20.3    13
                        23.0    19    24.7    22       
          ----------------------------------------------------
               R1=53         R2=65        R3=103         R4=32
  • Kruskal-Wallis statistic: