15. Glucose Tolerance Physicians depend on laboratory test results when managing medical problems such as diabetes or epilepsy. In a test for glucose tolerance, three different laboratories were each sent nt 55 identical blood samples from a person who had drunk 50 milligrams (mg) of glucose dissolved in water. The laboratory results (in mg/dl) are listed here:

a. Do the data indicate a difference in the average readings for the three laboratories?

b. Use Tukey’s method for paired comparisons to rank the three treatment means. Use a =.05.

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Lab 1 Lab 2 Lab 3 120.1 98.3 103.0 110.7 112.1 108.5 108.9 107.7 101.1 104.2 107.9 110.0 100.4 99.2 105.4