A fertilizer company has just developed a new type of soil which they believe will enhance the effectiveness of fertilizer in increasing annual crop yield The company wishes to use regression analysis with an interaction term to show that this is true The company conducted a controlled experiment involving 20 individual plots 5 of which the used soil only 5 of which used the fertilizer only 5 of which used both the soil and fertilizer and 5 0f which used neither product The results of the exp

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