An alternative to the GC-ECD method for determining dioxines, mentioned
in one of the previous questions, is GC-MS. The two methods are compared
by measuring the same set of 8 samples in triplicate. The mean values
are plotted below.
The intercept of the best line through the points is -2.9, with an s.d.
of 3.2, and the slope is 1.3 with an s.d. of 0.3. Which of the following
statements is correct?