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Statistical Technique.
Member rating: No Rating | Words: | Submitted: Tue Feb 10 2004
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Statistical Technique The Mann-Whitney U Test will be used as differences between two treatments (two carbohydrates, sucrose and glucose) are being investigated and measurements have been taken at least six times with each treatment. Random sampling will therefore be useful and the data summarised using the median. Results Table: This table shows the volume of gas collected in five minutes in cm from each carbohydrate . Starch Sucrose Lactose Glucose 0 4 0 4 0 3 0 6 0 3 0 6 0 3 0 4 0 2 0 5 0 3 0 4 As neither starch nor lactose produced any result they shall not be investigated in the statistical test. Null Hypothesis: there is no difference between the volume of gas produced by sucrose or by glucose. Data set A: Rankings 7.5 3.5 3.5 3.5 1 3.5 Data set A: Observations 4 3 3 3 2 3 Data set B: Rankings 7.5 11.5 11.5 7.5 10 7.5 Data set B: Observations 4 6 6 4 5 4 Ra = 22.5 Na = 6 Nb = 6 Rb = 55.5 Ra + Rb = [(Na + Nb)(Na + Nb + 1)] = Ra + Rb = 78 2 Ua = NaNb + Nb(Nb + 1) - Rb = Ua = 36 + 21 - 55.5 = 1.5 2 Ub...
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