Carbon dioxide (Chapter 20]. Because plants use CO; to fuel photosynthesis, more CO; may cause trees and other plants to grow faster. An elaborate apparatus allows researchers to pipe extra CO2 to a...

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Extracted text: Carbon dioxide (Chapter 20]. Because plants use CO; to fuel photosynthesis, more CO; may cause trees and other plants to grow faster. An elaborate apparatus allows researchers to pipe extra CO2 to a 30-meter circle of forest. They selected two nearby circles in each of three parts of a pine forest and randomly chose one of each pair to receive extra CO,. The response variable is the mean increase in base area in m² for 30 to 40 trees in a circle during a growing season. We measure this in percent increase per year. The following are one year's data. This is a matched pairs design. Compute and report differences to 10.001 in the single column table at the lower right. Use a = 5%. Diff (Trt - Con) Pair Control plot Treated plot 9.752 10.587 3 7.263 5.742 9.244 8.675