A soil scientist compared the organic carbon (%OC) of soils from intensively cultivated fields against soils from undisturbed forested sites. Test whether the %OC levels of the two groups of soils are same by giving the 95% confidence limits for their difference. In your answer, clearly state a null hypothesis and conclusions.

Cultivated soils	Forest soils
4.0	5.2
3.6	6.1
4.2	4.5
4.6	4.8
4.9	4.7
5.2	6.1
4.3	5.9
	4.8