Researchers are interested in whether rearing conditions lead to aggression in laboratory animals. The animals were randomly assigned to be reared under three different conditions. The following table...

Researchers are interested in whether rearing conditions lead to aggression in laboratory animals. The animals were randomly assigned to be reared under three different conditions. The following table shows the aggression scores for each animal. Does the mean aggression score differ for the three groups? Use a 5% level of significance.  1) the appropriate null and alternative hypotheses; 2) the appropriate test; 3) the decision rule; 4) the calculation of the test statistic; and 5) your conclusion including a comparison to alpha or the critical value.

Rearing Condition

Extremely Crowded        Moderately Crowded     Not Crowded

30                                                     20                                       10

30                                                     10                                       10

30                                                     15                                       20

25                                                     20                                       10

35                                                     20                                       10

30                                                     20                                       20

20                                                     25                                       10

25                                                     30                                       20

30                                                     25                                       10