In each of Exercises C.119–C.125, we have presented a study conducted using randomized block ANOVA and have displayed corresponding computer output that contains a randomized block ANOVA table, marginal means, and interaction plots. For each exercise, use Procedure C.4 on page C-71 to perform a randomized block ANOVA at the 5% individual significance level. (Note: Assume that it is reasonable to consider the assumptions for performing a randomized block ANOVA met in each case.)
C.119 Cholesterol Testing. A large health care organization uses three laboratories for the routine analysis of blood samples. It is important that the three labs provide equivalent test results. To check that, blood samples are obtained from 10 randomly selected individuals; each blood sample is then divided into three blood subsamples of equal volume; and then the three blood subsamples from each person are sent to different labs. For this problem, the analysis is confined to assessing the measurement of the total cholesterol level for a person. The data are in the following table. We performed a randomized block ANOVA on the data. Output C.34 on page C-82 shows the resulting computer output and also supplies a table of marginal means. Output C.35 on page C-82 shows the interaction plots.
OUTPUT C.34
output for Exercise C.119
(and Exercise C.126)
ANOVA: CHOLESTEROL versus LAB, PERSON
OUTPUT C. 35
output for Exercise C.119 (and Exercise C.126)
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