20. Four different medicines are being tested to determine if they differ in ability to help patients reduce cholesterol levels. The data is in the Excel worksheet. a) Perform an ANOVA to determine if the medicines differ. Ho: Ha: Test Statistic: (2-decimals). p-value: (3-decimals) b) Perform a test for equal variance for the four medicines using the residuals. Ho: Ha: Bartlett: Test Statistic: (2-dec) p-value: (3-dec) Levene: Test Statistic: (2-dec)_ p-value: (3-dec) c) Perform Welch's ANOVA on our data set. Ho: Test Statistic: (2-decimals)_ Ha: p-value: (3-decimals). d) Based solely on the information in the parts above, what is your final decision about the medicines? Not Different Different Prob 20 Chol Med Drop 1 20.1 1 15.3 1 11.4 1 10.5 1 8.9 1 5.2 1 1.4 2 5.7 2 6.8 2 8.2 2 4.5 2 11.5 3 11.5 3 15.6 3 13.6 3 13.2 3 11.1 4 2.5 4 12.5 4 20.4 4 32.5 4 42.1

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