A psychologist would like to analyze the effects of new drug on activity level of animals. Three samples of rats are chosen with n = 5 in each sample. One group gets no drug, one group gets a small dose, and third group gets a large dose. The psychologist records the activity level for each animal. The data from this experiment are presented below.
Find out whether these data point to any significant differences among the treatments.
No drug Small dose Large dose
0 1 5
1 3 8
3 4 6 G = 45
0 1 4 ?X2 = 229
1 1 7
T = 5 T = 10 T = 30
SS = 6 SS = 8 SS = 10
Step 1 Describe the hypothesis:
Step 2 Describe the alpha level and reason for selecting it:
Step 3 Point to which statistic you have selected:
Step 4 Compute and list your Sum of Squares:
Step 5 Compute and list your d.f. values:
Step 6 Describe the rejection rule:
Step 7 Compute Mean Squares and the F-ratio
Step 8 Make a decision whether to accept or reject null hypotheses and state your decision in terms of problem
Step 9 Point to whether post hoc testing is or isn't warranted: