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Figure 4.4 Samples for Exercise 4.1 Answer a. Sample A b. Sample C Solution a. We see that Sample A has the largest mean (around 30) and only one data point below 25, so it provides the most evidence for the claim that the mean placement exam score is greater than 25. b. Sample C has a mean that is clearly below 25, so it provides no evidence for the claim. 4.2 Testing to see if there is evidence that the mean service time at Restaurant #1 is less than the mean service time at Restaurant #2. Use Figure 4.5 and assume that the sample sizes are all the same. Sample means are shown with circles on the boxplots. 20 15 10 - 5 Group 2 2 2 Sample A Sample B Sample C Sample D