Question

The foundation of experimental design comes from agriculture. Here is a typical experiment. You want to study the effect of two fertilizers, sulfate of ammonia and superphosphate, on the yield of Brussels sprouts. Each fertilizer is used at four levels: 0, 30, 60, and 90 pounds per acre.

a/ Describe the response variable

b/ Describe the treatments. How many levels for each treatment?

c/ List a complete set of treatment combinations. Arrange your list in table form

d/ Suppose you have sixty-four one-acre plots similar in soil condition. Which important design principle would you use to assign treatments to units?

Answer 1