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

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Anwar Sufi 12N        Centre Number: 10257

Biology Coursework Analysis        Candidate Number: 1186

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.

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.

Using the table of critical values at 95% confidence level, this means that I am 95% confident that my results are not due to chance. The critical value is 0.679 because it has 10 pairs of variables. Since the Spearman’s rank coefficient of correlation of 0.588 is lower than the critical value of 0.679, we accept the Null hypothesis and reject the alternative hypothesis.

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Graph of Correlation of Abundance:

This shows that as the distance from the path increases the abundance of creeping moss also increases. My graph shows that there are 2 anomalous results. Ignoring these 2 anomalous results the correlation is very strong and positive. The reason for one of the anomalous results is that I had started from the start of the footpath where there is a lower amount of trampling than the middle of it. The reason for the other anomalous result is that as I was moving away from 1 footpath I was beginning to move ...

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