Comparing the Density of Skimmed and Homogenised Milk

... Comparing the Density of Skimmed and Homogenised Milk Results Skimmed Milk Sample x (x - x) (x - x)2 1 21.75 1.74 3.03 2 16.6 -3.41 11.69 3 23.81 3.8 14.44 4 19.31 -0.7 0.49 5 18.97 -1.04 1.08 Mean 20.01 30.73 Homogenised Milk Sample x (x - x) (x - x)2 1 21.94 0.25 0.06 2 21.57 -0.12 0.01 3 23.53 1.84 3.39 4 20.78 -0.91 0.83 5 20.62 -1.07 1.14 Mean 21.69 5.43 Analysis The mean results were; 20.01 seconds for skimmed milk, and 21.69 seconds for homogenised milk. This indicates that skimmed milk may have a higher density than that of homogenised milk, as it falls faster through the copper(II) sulphate solution. To attempt to verify this, I will find the standard deviation of both sets of results. This will make it more certain to establish whether or not the densities are significantly different. Standard Deviation Skimmed milk V?(x - x)2 N - 1 V30.73 4 = 2.77 (2 d.p.) Homogenised milk V?(x - x)2 N - 1 V5.43 4 = 1.17 (2 d.p.) Now that the standard deviation has been calculated for both types of milk. I can see that the difference is significant enough to suggest that Skimmed milk does indeed have a higher density than Homogenised milk. In order to further substantiate

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