The data in the accompanying table represent the concentration of glucose in the blood serum of an adult patient. On four consecutive days, a blood sample was drawn from the patient and analyzed in triplicate. The variance for a given sample is an estimate of the measurement variance while the day-to-day variance reflects both the measurement variance and the sampling variance.

(a) Perform an analysis of variance, and see whether the mean concentrations vary significantly from day to day.
(b) Estimate the sampling variance.
(c) What is the best way to lower the overall variance?

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Day Glucose Concentration, mg/100 mL 60 57 47 59 62 58 51 54 63 57 48 57