For Exercises 31–34, assume that the data are independently drawn random samples from normal populations.

  1. Verify the equal-variance assumption.
  2. Calculate the following measures:
    1. and
    3. SSTR
    4. SSE
    5. SST
    6. MSTR
    7. MSE
  3. Construct the ANOVA table.
  4. Perform the appropriate one-way ANOVA using level of significance .

Question 12.34

fullmoon

34. The Full Moon and Emergency Room Visits. Is there a difference in emergency room visits before, during, and after a full moon? A study looked at the admission rate (number of patients per day) to the emergency room of a Virginia mental health clinic over a series of 12 full moons.2 The data are provided in the table. Is there evidence of a difference in emergency room visits before, during, and after the full moon?

Before During After
6.4 11.5 5 13 5.8 13.5
7.1 13.8 13 16 9.2 13.1
6.5 15.4 14 25 7.9 15.8
8.6 15.7 12 14 7.7 13.3
8.1 11.7 6 14 11.0 12.8
10.4 15.8 9 20 12.9 14.5