Question

Collett (2003) argues that two outliers need to be removed from the plasma data. try to identify those two unusual observations by means of a scatterplot. (7.2 on handbook)

Answer 1

Answer : There will be two outliers occurring where fibrinogen levels encroach and exceed 4. The two points, where ESR is less than 20 occur at high fibrinogen levels in the blood, the first is the closest point to 4, and the second is beyond a fibrinogen level of 5.

We can assume and deduce the two outliers not only because of the high levels of fibrinogen, but because the globulin levels do not increase as deduced by the other points in the plot.

Refer the attachment for clear understanding.