8.100 lodine Concentration Based on repeated measurements of the iodine concentration in a solution, a chemist reports the concentration as 4.614 moles/litre, with an "error margin of 0.006."

a. How would you interpret the chemist's "error margin"?

b. If the reported concentration is based on a random sample of n 30 measurements, with a sample standard deviations 0.017, would you agree that the chemist's "error margin" is 0.006?