In each of Exercises C.168–C.I74, determine whether the number of observations is large enough to use Friedman 's test as given in Procedure C.6 on page C-102. If the number of observations is large enough, apply that procedure to perform a Friedman test at the 5% significance level using either the critical-value approach or the P-value approach.
C.168 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 lest 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.
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