The concentration of carbon dioxide (CO_2) in the atmosphere is increasing rapid

Question

The concentration of carbon dioxide (CO_2) in the atmosphere is increasing rapidly due to our use of fossil fuels. Because green plants use CO_2 to fuel photosynthesis, more CO_2 may cause trees to grow faster. An elaborate apparatus allows researchers to pipe extra CO_2 to a 30-meter circle of forest. We want to compare the growth in base area of trees In treated and untreated areas to see if extra CO_2 does in fact increase growth. We can afford to treat three circular areas. Describe the design of a completely randomized experiment. Sketch 6 well-separated 30-meter circular areas in the pine forest. Randomly choose 3 of them and treat them with extra CO_2. Compare the growth of trees after the treatment with their growth before the treatment. Sketch 6 weft-separated 30-meter circular areas in the pine forest. Randomly choose 3 of them and treat them with extra CO_2. Compare the growth of trees in the two groups. Sketch 3 well-separated 30-meter circular areas in the pine forest. Treat these areas with extra CO_2. Compare the growth of trees after the treatment, with their growth before the treatment. Sketch 3 pairs of well-separated 30-meter circular areas in the pine forest. Randomly choose one area from each pair and treat it with extra CO_2. Compare the growth of the treated trees with the growth of the untreated ones.

Explanation / Answer

10) Answer 4

       Sketch 3 pairs of well-seperated 30-meter circular areas in the pine forst. Randomly choose one area from each pair and treat with extra CO2 . Compare the growth of the treated trees with the growth of the untreated ones.

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