6. (6%) How does gas-liquid chromatography work? List the variables that lead to band broadening in gas-liquid chromatography.

1. (5%) A new automated procedure for determining glucose in serum (Method A) is to be compared with the established method (Method B). Both methods are performed on serum from the sarne six patients to eliminate patient-to-patient variability. Do the following results confirm a difference in the two methods at the 95% confidence level?