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Statistical Analysis Of Hedgerow Survey Data

I would like to compare data from a study I have been doing, but don't know which statistical tests to use.
I have surveyed 40 hedgerows:
20 from site 1
20 from site 2

I have attached some of the data to show you at what stage I'm at:

1). I need to find out the significance of difference between the 2 sites in terms of their 'woody species' composition.
Would something like a t-test work for this?

2). Do some stats on other attributes of the hedgerows.
e.g. I want to compare the 'gapiness' of the hedgerows from both sites, therefore I surveyed them into 4 categories (None, <10%, 10-30%, 30%+)what stat test could I use to show the differences between the 2 sites?

I would be grateful if you could look at the attatched files and suggest some suitable stat tests, and give a short explaination for why they should be used.

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Hi there

I took a look at your data sheet, and I can help guide you with the stats.

Whenever you want to compair differences between two groups the appropriate tool would be the T test.

To do this test, you would have to find the means of the two ...

Solution Summary

The statistical analysis of Hedgerow survey data is examined. The significance of differences between the two sites in terms of their 'woody species' is determined.

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