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Elevated levels of blood urea nitrogen (BUN) denote poor kidney function. Tenelderly cats showing early signs of renal failure are randomly divided into twogroups. Group 1 (control group) is placed on a standard high-protein diet. Group 2(intervention group) is placed on a low-phosphorus high-protein diet. Their BUNis measured both initially and three months later. The data is shown in Table 5.20.Use a = 0.05 in all parts of this problem.
(a) Was there a significant increase in mean BUN for Group 1?(b) Was there a significant increase in mean BUN for Group 2?(c) Did the two groups differ in their mean change in BUN? If so, which appearedto have the least increase?