analytical chemistry

Question 1

We will evaluate two different methods for measuring the concentration of phenol (ppm) in a process liquid.

The following data for method A (the old method) and method B (the new method) are obtained:

Method A: 6.5, 6.3, 6.6, 6.7, 6.4, 6.2, 6.6, 6.4, 6.3, 6.5, 9.3

Method B: 6.8, 6.9, 6.7, 6.6, 6.8

Hint! don't forget to remove any outliers.

a) Determine if there is any difference in accuracy between the methods. b) Determine if there is any difference in precision between the methods.

c) Construct a 95% confidence interval for phenol in the process fluid. Use measurement data from both method A and B.

d) Investigate whether Method B has significantly greater variation than Method A.