The Mean, Median And Range Of All The Raw Data Were Calculated. A

The mean, median and range of all the raw data were calculated.
A Mann-Whitney U test with a 5% significance level was chosen to test for a significant difference in the clover population in unmown and mown grass. This test suits our data as we could not assume a normal distribution of clover population. It will be a one-tailed Mann Whitney U test as our research hypothesis states there will be a difference in the populations. A t-test with a significance level of 5% was used to investigate differences in water content and humus content of the soil in unmown and mown grassland.Results
Investigation of the clover population
The raw data from the quadrants placed in the unmown and mown grasslands are in Appendix I.
The median percentage of clover in unmown grassland is 6.50 and the range is from 2% to 14%. The mean percentage of clover in unmown grassland is 6.75%, and the standard deviation is 3.49%.
The median percentage of clover in mown grassland is 16.5, and the range is 8% to 55%. The mean percentage of clover in mown grassland is 21.50%, and the standard deviation is 13.01%.
The mean percentages of clover in unmown and mown grassland were graphed (Figure 1). The error bars are the standard error, calculated as the standard deviation/ Square root (N).
Figure 1 The mean percentage of clover in mown and unmown grassland ± standard error.

A Mann Whitney U test was conducted on the raw data of clover population. A significance level of 5% was chosen. The Na value was 20 and the Nb value was 20. The U value obtained from the ranked data was 200. This is higher than the critical table value of 138 so the null hypothesis was rejected and the research hypothesis was accepted. There is a significant difference in the population of white clover in unmown and mown grassland.
Light reading
The light reading of unmown grassland was 1291.68 lux and the light reading of mown grassland was 90525.24 lux. Soil in mown grassland therefore receives more light.
pH reading
The pH of soil in the unmown grassland was 7.5. The pH of soil in the mown grassland was 5.52. The soil in mown grassland is therefore more acidic.
Water content of the soil
The raw data for water content in unmown and mown grassland is in Appendix I. The mean percentage water content in unmown grassland was 3.41% with a standard deviation of 0.69%. The mean percentage water content in mown grassland was 6.47% with a standard deviation of 1.35%.
The mean percentage water content in unmown and mown grassland was graphed (Figure 2). The error bars are the standard error, calculated as the standard deviation/ Square root (N).
Figure 2 The mean percentage water content in unmown and mown grassland ± SE
A two-tailed t-test was carried out to investigate if the water content of soil in unmown and mown grassland is significantly different. A significance level of 5% was chosen.