10. (8%) What is the purpose of an internal standard in ICP-MS? List the characteristics that are often cited as requirements for a good internal standard.

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?