Chapter 12.2, Problem 9E

For Exercises 9 through 13, do a complete one-way ANOVA. If the null hypothesis is rejected, use either the Scheffe or Tukey test to see if there is a significant difference in the pairs of means. Assume all assumptions are met.

9. Emergency Room Visits Fractures accounted for 2.4% of all U.S. emergency room visits for a total of 389,000 visits for a recent year. A random sample of weekly ER visits is recorded for three hospitals in a large metropolitan area during the summer months. At a = 0.05, is there sufficient evidence to conclude a difference in means?

Hospital X	Hospital Y	Hospital Z
28	30	25
27	18	20
40	34	30
45	28	22
29	26	18
25	31	20