l. PKU (phenylkelonuria) is a disease in which the storage of an enzyme prevents the body from producing enough dopamine. a substance that helps nansmit nerve impulses. To some extent. you can relieve the symptoms by eating a restricted diet. one low in the amino acid phenylalanine. A study was designed to measure the effect of such a diet on the levels of dopamine in the body. The subjects were ten PKU patients. Each patient was measured twice. one after a week on a low phenylalanine diet and again after a week on a regular diet. a} Describe the design used in this study. [Completely randomized, randomized block, or randomized matched pair] b} Identify blocks {if any]. o) Identify the lreatments. d} Describe how the experimenters eould have randomly assigned the treatments. e} What is the mspcnse variable? e} Could this experiment involve blinding? Doubleblinding