Example 3: Fully Random Assignment Four new word-processing programs are to be compared by measuring the speed with which standard tasks can be completed. One hundred volunteers are randomly assigned to one of the four programs and their speeds are measured. Design and diagram a fully random experiment. Example 4: Block Design The progress of a type of cancer differs in women and men. A clinical experiment to compare three therapies for this cancer was proposed (radiation, chemotherapy, combination of radiation and chemotherapy). 63 men and 42 women who have this cancer are selected to take part in this experiment. Design and diagram a blocked experiment. Example 5: Matched Pairs Suppose that the manufacturer wants to test a new fertilizer against the current one on the market. Five 2- acre plots of land scattered throughout the county are used. Each plot is subdivided into two subplots, one of which is treated with the current fertilizer, and the other with the new fertilizer. Wheat is planted and the crop yields are measured. Design and diagram a matched-pairs experiment