A farmer wishes to test the effects of a new fertilizer on her tomato yield. She has four equal-sized plots of land-- one with sandy soil, one with rocky soil, one with clay-rich soil, and one with average soil.
She divides each of the four plots into three equal-sized portions and randomly labels them A, B, and C. The four A portions of land are treated with her old fertilizer. The four B portions are treated with the new fertilizer, and the four Cs are treated with no fertilizer. At harvest time, the tomato yield is recorded for each section of land. What type of experimental design is this? A) randomized block design B) completely randomized design
C) matched-pairs design D) double-blind design
Question 2
When performing a multiple linear regression, if we test the null hypothesis that the coefficients are all zero, what is the decision rule?
A) If p < , then reject the null hypothesis.
B) If p > , then reject the null hypothesis.
C) If p < , then fail to reject the null hypothesis.
D) If p > , then fail to reject the alternative hypothesis.
The Ames test for mutagenicity.
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