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Chris Ellison An investigation into the density of 'mock blood' Sample A - blood taken from a normal healthy adult male who lives at sea level. Sample B - blood taken from the same male after six months of aerobic exercise. Sample C - blood taken from the same male after training for three months at altitude. Results Time taken for a drop of the sample to fall through 100cm3 of Copper (II) Sulphate Solution. Sample A (Seconds) Sample B (Seconds) Sample C (Seconds) 11.5 12.0 10.0 11.5 13.0 8.0 14.5 12.0 10.0 14.0 12.0 7.5 12.0 13.5 10.0 12.5 14.0 11.0 14.0 16.0 7.0 12.5 12.0 8.5 16.5 14.5 9.5 12.0 11.5 7.5 Mean 13.10 Mean 13.05 Mean 8.5 Now I am going to carry out some statistics on my results to find if they occurred by chance or not. I am going to use the t-test because I need to compare two sets of results that I collected. T-test tables Sample A x x-x (x-x)2 11.5 1.60 2.56 11.5 1.60 2.56 14.5 1.40 1.96 14.0 0.90 0.81 12.0 1.10 1.21 12.5 0.60 0.36 14.0 0.90 0.81 12.5 0.60 0.36 16.5 3.40 11.56 12.0 1.10 1.21 x = 13.10 ? = 23.4 Sample B x x-x (x-x)2 12.0 1.05 1.10 13.0 0.05 0.30 12.0 1.05 1.10 12.0 1.05 1.10 13.5 0.45 0.20 14.0 1.05 1.10 16.0 2.95 8.70 12.0 1.05 1.10 14.5 1.45 2.10 11.5 1.45 2.10 x = 13.05 ? = 18.63 Sample C x x-x (x-x)2 10.0 1.10 1.21 8.0 0.90 3.61 10.0 1.10 1.21 7.5 1.40 1.96 10.0 1.10 1.21 11.0 2.10 4.41 7.0 1.90 3.61 8.5 0.40 1.96 9.5 0.60 0.36 7.5 1.40 1.96 x = 8.5 ? = 21.52 T-tests Sample A compared to Sample B Degrees of Freedom = 18 Variance (S2) = S2A= 2.60 S2B= 2.07 Sample A compared with Sample C Degrees of Freedom...

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