observational? ing or to on humans 2-4 Finger tapping. Many people rely on the caffeine in coffee to get them going in the morn- mains theobromine, an alkaloid quite similar to caffeine, both in its structure and in its effects o keep them going at night. Wouldn't you really rather eat chocolate? Chocolate con theobromine, and a placebo. Their design used four subjects as blocks and assigned the three In 1944, Scott and Chen reported the results of a study designed to compare caffeine, were trained to tap their fingers in such a way that the rate could be measured; presumably treatments to each subject in a random order, one drug on each of three different days. Subjects the training got rid of any practice effect. The response was the rate of tapping two hours af- ter taking a capsule containing either a drug or the placebo. cural factors, and tell how many levels each has. What is the unit for this experiment? should the investigators have used? Draw and label a diagram that shows your design; tell 3. Suppose there had been six subjects instead of four. What design, based on Latin squares, what each row, column, and letter means. Then write the factor diagram. 4. Now suppose you had no additional subjects beyond the original four but you wanted to include a third alkaloid, nicotine, in your comparisons. Draw and label a diagram that shows what design you would use. Then write the factor diagram. 5-8 Wireworms. This experiment was designed to compare the effectiveness of five different b. Write the factor diagram. Draw and label a rectangular table for the data from this experiment. List the struc- 2. col fumigation treatments (K, M. Put in R studioms. The treatments were squal applied numbers of wil vorms observational? ing or to on humans 2-4 Finger tapping. Many people rely on the caffeine in coffee to get them going in the morn- mains theobromine, an alkaloid quite similar to caffeine, both in its structure and in its effects o keep them going at night. Wouldn't you really rather eat chocolate? Chocolate con theobromine, and a placebo. Their design used four subjects as blocks and assigned the three In 1944, Scott and Chen reported the results of a study designed to compare caffeine, were trained to tap their fingers in such a way that the rate could be measured; presumably treatments to each subject in a random order, one drug on each of three different days. Subjects the training got rid of any practice effect. The response was the rate of tapping two hours af- ter taking a capsule containing either a drug or the placebo. cural factors, and tell how many levels each has. What is the unit for this experiment? should the investigators have used? Draw and label a diagram that shows your design; tell 3. Suppose there had been six subjects instead of four. What design, based on Latin squares, what each row, column, and letter means. Then write the factor diagram. 4. Now suppose you had no additional subjects beyond the original four but you wanted to include a third alkaloid, nicotine, in your comparisons. Draw and label a diagram that shows what design you would use. Then write the factor diagram. 5-8 Wireworms. This experiment was designed to compare the effectiveness of five different b. Write the factor diagram. Draw and label a rectangular table for the data from this experiment. List the struc- 2. col fumigation treatments (K, M. Put in R studioms. The treatments were squal applied numbers of wil vorms