"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 17 4 18 14 18 15 15 10 12 Logged Does logging significantly reduce the mean number of species in a plot? Assume equal population variances and use a = 0.05. Use the difference: logged - unlogged. 1. Test Stat: 2. Critical Region: a. T> -1.729 b. Tabs (-1.729) c. T< -1.729 d. T> abs (-1.729) 3. Conclusion: At 5% level of significance a. logging reduces the mean number of species in the plot b. there is no evidence that logging reduces the mean number of species in the plot
"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 17 4 18 14 18 15 15 10 12 Logged Does logging significantly reduce the mean number of species in a plot? Assume equal population variances and use a = 0.05. Use the difference: logged - unlogged. 1. Test Stat: 2. Critical Region: a. T> -1.729 b. Tabs (-1.729) c. T< -1.729 d. T> abs (-1.729) 3. Conclusion: At 5% level of significance a. logging reduces the mean number of species in the plot b. there is no evidence that logging reduces the mean number of species in the plot
Glencoe Algebra 1, Student Edition, 9780079039897, 0079039898, 2018
18th Edition
ISBN:9780079039897
Author:Carter
Publisher:Carter
Chapter10: Statistics
Section10.6: Summarizing Categorical Data
Problem 23PPS
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Question
Answer the following problem about hypothesis testing with up to four decimal places.
Transcribed Image Text:"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
17 4 18 14 18 15 15 10 12
Logged
Does logging significantly reduce the mean number of species in a plot? Assume
equal population variances and use a = 0.05. Use the difference: logged - unlogged.
1. Test Stat:
2. Critical Region:
a. T> -1.729
b. Tabs (-1.729)
c. T< -1.729
d. T> abs (-1.729)
3. Conclusion: At 5% level of significance
a. logging reduces the mean number of species in the plot
b. there is no evidence that logging reduces the mean number of species
in the plot
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