... Sum of the roots of dandelions obtained in both sites * The percentages may not be exactly correct and representing the real density of dandelions in these two sites, such as shown in the charts: the data between the pooled and my group's data are not the same, but with only 1% difference. * The average of the total roots obtained by all the groups can be calculated by "sum divide by the number of sampling (80)". From this formula it arrives that, the average value for the site 1 is 325/80=4.0625roots; and site 2 is 32/80=0.4roots. * Standard deviation can be calculated by: Therefore, the site 1 has standard deviation of 2.570718528 and the site 2 has 0.7681145748 Conclusion and Evaluation The density of certain organisms differ from one place to another, even though they may all grow up in the same region, i.e. two contrasting parts of a park. Using the random sampling, with ...

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