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2. [8 marks] A pediatrician randomly selected 6 young patients to participate in a nutritional program designed to lower blood cholesterol levels. The cholesterol levels of the 6 patients were measured before, and two months after, the program started. Results are summarized below: Patient 3' 1 2 i 3 i 4 i 5 i 6 \\ Blood cholesterol level (gfL) Before program, B]. 2.14 2.13 2.15 2.12 2.04 2.01 Blood cholesterol level (gfL) After program, 143- 2.12 2.10 2.10 2.13 2.00 1.99 Difference in blood cholesterol D3; = 33 A, 0.02 0.03 0.05 0.01 0.04 0.02 (a) Dene the differences in blood cholesterol in R: D