A drug company wishes to compare the effects of three different drugs (X, Y, and Z) that are being developed to reduce cholesterol levels. Each drug is administered to six patients at the recommended dosage for six months. At the end of this period the reduction in cholesterol level is recorded for each patient. The results are given in Table 11.18. Completely analyze these data using one-way ANOVA. Use the MINITAB output in Figure 11.17.
TABLE 11.18
Reduction of Cholesterol Levels

FIGURE 11.17
MINITAB Output of an ANOVA of the Cholesterol Reduction Data

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Drug X Y Z 22 40 15 31 35 19 47 14 27 41 11 25 39 21 18 33 5 One-way ANOVA: Reduction versus Drug ource DF 2 2152.11076.1 40.79 0.000 395.7 2547.8 R-Sq eror 15 otal 17 s 5.136 Descriptive Statistics: Reduction Variable Reduction 26.4 30 20 10 84.47% R-Sq (adj) 82.40% = DrugN MeanStDev 6 23.67 4.97 Y 6 39.17 .92 5.50 3 2 6 12.50