How badly does logging damage tropical rain forests? One s ogged with similar plots nearby that had been logged 8 yea somewhat less severe than expected. Here are the data on plots. Unlogged: 13 21 19 21 15 18 21 21 14 13 21 23 Logged: 4 14 16 12 13 10 11 16 15 ciani icantlL reduce the mean Dum

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How badly does logging damage tropical rain forests? One study compared forest plots in Borneo that had never been
logged with similar plots nearby that had been logged 8 years earlier. The study found that the effects of logging were
somewhat less severe than expected. Here are the data on the number of tree species in 12 unlogged plots and 9 logged
plots.
Unlogged: 13 21 19 21 15 18 21 21 14 13 21 23
Logged:
4 14 16 12 13 10 11 16 15
(a) Does logging significantly reduce the mean number of species in a plot after 8 years? Give appropriate
statistical evidence to support your conclusion. (Use a = .05 and conservative degrees of freedom.)
Ho: HU -Select-
HL
Ha: Hu -
Select---
---
P-value =
Conclusion
O There is significant evidence that logging reduces the mean number of species in a plot after 8 years.
O There is no evidence that logging significantly reduces the mean number of species in a plot after 8
years.
(b) Give a 80% confidence interval for the difference in mean number of species between unlogged and logged
plots.
lower bound
upper bound
Transcribed Image Text:How badly does logging damage tropical rain forests? One study compared forest plots in Borneo that had never been logged with similar plots nearby that had been logged 8 years earlier. The study found that the effects of logging were somewhat less severe than expected. Here are the data on the number of tree species in 12 unlogged plots and 9 logged plots. Unlogged: 13 21 19 21 15 18 21 21 14 13 21 23 Logged: 4 14 16 12 13 10 11 16 15 (a) Does logging significantly reduce the mean number of species in a plot after 8 years? Give appropriate statistical evidence to support your conclusion. (Use a = .05 and conservative degrees of freedom.) Ho: HU -Select- HL Ha: Hu - Select--- --- P-value = Conclusion O There is significant evidence that logging reduces the mean number of species in a plot after 8 years. O There is no evidence that logging significantly reduces the mean number of species in a plot after 8 years. (b) Give a 80% confidence interval for the difference in mean number of species between unlogged and logged plots. lower bound upper bound
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