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(1 point) "Conservationists have despaired over destruction of tropical rain forest by logging, clearing, and burning."...

(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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