Question

The article “Increased Risk for Vitamin A Toxicity in Severe Hypertriglyceridemia” [Annals of Internal Medicine (1987) 105: 877– 879 (© American College of Physicians)] illustrates the importance of checking whether the appropriate conditions have been met prior to applying a statistical procedure. The data consist of the retinyl ester concentrations (mg/dl) of nine normal-individuals and nine Type V hyperlipoproteinemic subjects.
a. Assess whether the data sets support the condition that both population distributions have normal distributions with equal variances.
b. Test for a difference in the mean retinyl ester concentrations of the two groups using the pooled t test, separate-variance t test, and Wilcoxon rank sum test. Use α = .01.
c. Based on your conclusions in part (a), which test statistic would you recommend to test for a difference in the mean retinyl ester concentrations of the two groups?


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  • CreatedNovember 21, 2015
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