Conservationists have despaired over destruction of tropical rain forest by logg

Question

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

 

 

 

Give a 90% confidence interval for the difference in mean number of species between unlogged and logged plots.  Which one:

0.461 to 7.205
-0.348 to 8.015
0.51 to 7.157
-0.268 to 7.935

Unlogged

22

18

22

20

15

21

13

13

19

13

19

15

Logged

17

4

18

14

18

15

15

10

12

 

 

 

Explanation / Answer

The first one!

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