Analytical Chemistry

0.271 6.20 5.68

0.457 6.03 5.74

(11) Find the equation for the regression line of y on x for the following pairs of values. Plot the graph
and comment upon its characteristics.

x 2 4 6 8 10

y 3 1 7 5 9

(12) A calibration exercise for an atomic absorption method to be used in the determination of a metal
yielded the following results:

Reference/mg kg–^1 Absorbance

0 0.021

2 0.050

4 0.090

6 0.126

8 0.173

10 0.210

12 0.247

Use the least squares method to plot the 'best fit' calibration curve. Comment upon its suitability for use.