(1 point) "Conservationists have despaired over destruction of tropical rain forest by logging, clearing, and burning." These words begin a report on a statistical study of the effects of logging in Borneo. Here are data on the number of tree species in 12 unlogged forest plots and 9 similar plots logged 8 years earlier:
Unlogged | 22 | 18 | 22 | 20 | 15 | 21 | 13 | 13 | 19 | 13 | 19 | 15 |
Logged | 17 | 4 | 18 | 14 | 18 | 15 | 15 | 10 | 12 |
Use the data to give a 90% confidence interval for the difference in mean number of species between unlogged and logged plots. Compute degrees of freedom using the conservative method.
Interval: ____________ to _________________
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