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Based on the principles of experimental design addressed in Appendix4, Step 1,select the correct description for Design C below. Design C 1.Variable Treatment 1Treatment 2 2.concentration of heavy metals in soil (ppm) 0 ppm 300ppm 3.concentration of nitrogen in soil (ppm) 40 ppm 40 ppm 4.concentration of water in soil (%) 36% 36% 5.temperature of air (\deg C) 15\deg C 30\deg C 6.light intensity (lux) 3000lux 3000 lux
a.Best design, only one variable is different b.Best design, two variables are different c.Not a good design, no variables are different d.Not a good design, two variables are different
Sagot :
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