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Analysis: Effect of Light on Abundance of Mayflies
Member rating: No Rating | Words: 1098 | Submitted: Wed Mar 19 2008
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ANALYSING The statistical test that I will be carrying out is Spearman Rank Correlation. I will be using this as I have two sets of continuous variables that can be ranked. This will help me analyse the data I have collected as I will be able to see from the result if there is a correlation in the abundance of flattened mayfly nymphs and light intensity. If there is a correlation present it will also tell me whether it is a positive or negative correlation. NULL HYPOTHESIS (H0): There is no correlation between the abundance of flattened mayfly nymphs and light intensity. No. of Pairs (n) Variable 1- Light Intensity Rank Variable 2- No. of Flattened Mayfly Nymphs Rank Difference Difference 2 (D2) 1 345 1 1 1.5 - 0.5 0.25 2 450 2 1 1.5 +0.5 0.25 3 735 3 4 3 0 0 4 1100 4 5 4 0 0 5 1550 5 8 6 -1.0 1 6 1950 6 6 5 +1.0 1 7 2250 7 16 7 0 0 8 2500 8 19 8 0 0 9 2750 9 22 9 0 0 10 3150 10 23 10 0 0 - ?D2 = 2.5 Rs = 1 - (6?D2) - n3 - n = 1 - (6 x 2.5) - 1000 - 10 = 1 - 15 - 990 ...
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