Conservationsts have despaired over destruction of tropical rain forest by loggging clearing and burning. These words begin a report on a statistical study of the effects of logging in borneo. Here are date on number of tree species in 12 unlogged forest plots and 9 similiar plots logged 8 years earlier.
What is the standard error? The correct answer is 1.813 but how do you get that? What is the test statistic? Correct answer is 2.11 but how do you get that?