Question: Electrical conductor: The scientists referred to in Exercise 1 also considered the effect of gypsum on the electrical conductivity (in decisiemens per meter) of soil.

Electrical conductor: The scientists referred to in Exercise 1 also considered the effect of gypsum on the electrical conductivity (in decisiemens per meter) of soil. Two types of soil were treated with three different amounts of gypsum. The results are as follows. No Gypsum Low Gypsum High Gypsum 1.49 0.91 Soil Type A 1.52

a. Can you reject the hypothesis of no interactions? Explain.

b. Can the main effect of the amount of gypsum be interpreted? If so, interpret the main effect. Use the α = 0.05 level of significance.

c. Can the main effect of soil type be interpreted? If so, interpret the main effect. Use the α = 0.05 level of significance.

No Gypsum Low Gypsum High Gypsum 1.49 0.91 Soil Type A 1.52 1.05 Soil Type B 1.01 0.92 1.12 0.92 0.99 0.92 0.88 0.92

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