Question: "Conservationists have despaired over destruction of tropical rainforest by logging, clearing, and burning." These words begin a report on a statistical study of the effects of logging in Borneo. Researchers compared forest plots that had never been logged (Group 1) with similar plots nearby that had been logged 1 year earlier (Group 2) and 8 years earlier (Group 3). All plots were 0.1 hectare in area. Here are the counts of trees for plots in each group:

Group 1: 27 22 29 21 19 33 16 20 24 27 28 19

Group 2: 12 12 15 9 20 18 17 14 14 2 17 19

Group 3: 18 4 22 15 18 19 22 12 12

Give a complete comparison of the three distributions, using both graphs and numerical summaries. To what extent has logging affected the count of trees? The researchers used an analysis based on .x and s. Explain why this is reasonably well justified.

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