Concept explainers
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 |
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Elementary Statistics: A Step By Step Approach
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