Laboratory animals were reared under three different conditions. The animals were randomly assigned to each group. 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. Make sure to 1. give the null and alternative hypotheses, 2. calculate the test statistic, and 3. give the conclusion (including a comparison to alpha or the critical value) to receive full credit.
|
Extremely Crowded
|
Moderately Crowded
|
Not Crowded
|
|
30
30
30
25
35
30
20
25
30
30
|
20
10
15
20
20
20
25
30
20
25
|
10
10
20
10
10
20
10
20
10
10
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