Question

The data below gives the concentration of thiol (mM) in blood lysate of 2 groups of volunteers, the first group being ‘normal’ and the second having rheumatoid arthritis:
Normal: 1.84, 1.92, 1.94, 1.92, 1.85, 1.91, 2.07 Rheumatoid: 2.81, 4.06, 3.62, 3.27, 3.27, 3.7

(a) verify that 2.07 is not an outlier for the ‘normal’ group

(b) show that the variances of the two groups differ significantly

Answer 1