Question

You are interested in determining the concentrations of copper(II) (the Cu²⁺ion) in soybeans, which are a major dietary source of copper. You analyze six samples of soybeans, from different growers (samples 1 through 6) viatwo methods: atomic absorption spectroscopy (method A) and UV-visible spectroscopy using the ligand neocuproine, whose complex Cu(neocuproine)₂²⁺is deeply orange-red in color (method B), and obtain the following results:

Sample	[Cu2+] (method A, in ppm)	[Cu2+] (method B, in ppm)
1	90	87
2	103	98
3	117	119
4	125	120
5	137	134
6	148	142

Use a Student’s t-test to determine if you can conclude, with 95% confidence, that the two analytical methods have significantly different systematic error.

Answer 1

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