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To investigate the effect of trampling on the frequency of creeping moss - Analysis

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Introduction

Statistics: For this data I will be using Spearman's Rank Coefficient of correlation. This type of data stat shows the relationship between the independent and dependant variables. Number Value (x) (Metres) Rank (Rx) Value (y) Rank(Ry) D = Rx-Ry D2 1 0.00 1 10.3 7 -6 36 2 1.25 2 0.67 2 0 0 3 2.50 3 0.33 1 2 4 4 3.75 4 2.00 3 1 1 5 5.00 5 2.07 4 1 1 6 6.25 6 9.33 5 1 1 7 7.50 7 21.3 9 -2 4 8 8.75 8 22.7 10 -2 4 9 10.0 9 18.7 8 1 1 10 11.25 10 9.7 6 4 16 _-_-_-_-_-_-_-_-_-_- _-_-_-_-_-_-_-_-_-_- _-_-_-_-_-_-_-_-_-_- _-_-_-_-_-_-_-_-_-_- Total 0 68 Once you have these you can work out Spearman's coefficient of correlation using this formula: Rs = 1- [6?D2/n3-n] 1- [408/990] 1- 0.412: = 0.588 (3 DP/SF) Null Hypothesis: There is not a significant relationship between the distance from the path and the abundance of creeping moss. Alternative Hypothesis: There is a significant relationship between the distance from the path and the abundance of creeping moss. This calculation will show me if I have a positive correlation and will also guide me as to accept or reject my hypothesis. ...read more.

Middle

Which is the actual results added together divided by the number of values. Distance (Metres) 0.00 1.25 2.50 3.75 5.00 6.25 7.50 8.75 10.0 11.25 Temperature OC 7.67 7.67 7.67 7.67 8.00 7.67 9.33 11.3 11.3 12.0 Distance (Metres) 0.00 1.25 2.50 3.75 5.00 6.25 7.50 8.75 10.0 11.25 Soil Depth (mm) 1 110 116 117 60.0 45.0 111 109 103 102 122 Soil Depth (mm) 2 120 70.0 95.0 74.0 62.0 80.0 156 110 113 112 Soil Depth (mm) 3 132 103 114 122 57.0 56.0 142 110 102 143 This table is the table for the average results using the method of calculating the mean for the average result. Which is the actual results added together divided by the number of values. Distance (Metres) 0.00 1.25 2.50 3.75 5.00 6.25 7.50 8.75 10.0 11.25 Soil Depth (mm) 121 96.3 109 85.3 54.7 82.8 136 108 106 126 Distance (Metres) 0.00 1.25 2.50 3.75 5.00 6.25 7.50 8.75 10.0 11.25 Soil pH 1 7.84 7.86 7.76 7.53 7.39 7.48 7.55 7.44 7.57 7.65 Soil pH 2 7.58 7.50 7.50 7.61 7.25 7.70 7.44 7.39 7.70 7.54 Soil pH 3 7.39 7.54 7.39 7.38 7.28 7.50 7.38 7.56 7.48 7.52 This table is the table for the average results using the method of calculating the mean for the average result. ...read more.

Conclusion

There is also a possible chance that there were rocks in the soil where I had put the soil pin into. Graph of Correlation of Soil pH: This graph shows a negative correlation. The soil pH is very close to neutral so this couldn't have had an effect on the abundance of creeping moss. It looks as if the correlation would have had an effect but the range of data is so small that it hasn't. The range of data is only approximately 0.325 of a pH level which is an insignificant amount. The optimum soil pH is a neutral level of pH, at a pH level of 7. Some of my results in the footpath are above 7.5 which is the level where the soil is too acidic for plant growth, so this could be another reason why there is a low abundance of creeping moss on the footpath. "If your soil has a pH value under 6.5, it is too acidic and you have to add ground limestone to bring it back into balance. If it is over 7.5, it is alkaline and you have to add soil sulfur." (http://www.articlecity.com/articles) ?? ?? ?? ?? Anwar Sufi 12N Centre Number: 10257 Biology Coursework Analysis Candidate Number: 1186 1 ...read more.

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