A cardiologist carries out a study to compare the impact of a statin and a natural product control on serum lipids. Individuals were assigned randomly to the statin and control groups. Measurements of total cholesterol, lower-density lipids (LDL) and blood pressure (BP) were taken at diagnosis and annually thereafter. The results are given in Table X.

The aim of your investigation is to answer the primary research question 'Do the statin and the natural product provide similar changes in serum lipids?'

Year 0 (diagnosis) Year 1 follow up TABLE X DATA ON THE COMPARISON OF THE EFFECTS OF STATIN AND CONTROL ON SERUM LIPIDS