Concept explainers
For Exercises 1 through 12, use the Kruskal-Wallis test and perform these steps.
a. State the hypotheses and identify the claim.
b. Find the critical value.
c. Compute the test value.
d. Make the decision.
e. Summarize the results.
Use the traditional method of hypothesis testing unless otherwise specified.
10. Amounts of Caffeine in Beverages The amounts of caffeine in randomly selected regular (small) servings of assorted beverages are listed. If someone wants to limit caffeine intake, does it really matter which beverage she or he chooses? Is there a difference in caffeine content at α = 0.05?
Teas | Coffees | Colas |
70 | 120 | 35 |
40 | 80 | 48 |
30 | 160 | 55 |
25 | 90 | 43 |
40 | 140 | 42 |
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