Terms to watch out for
natural: in the context of agriculture and chemical products, the terms natural and naturally derived should only be used to refer to substances and products that are 100% formed naturally, without the use of synthetic components or processes. See also green, sustainable
organic: in agriculture, refers to practices and products that do not use synthetic fertilisers or pesticides. In chemistry, an organic compound is any carbon compound, apart from a few types of compounds such as carbides, carbonates, simple oxides of carbon (eg CO and CO2) and cyanides
A null hypothesis is the negative counterpart of a hypothesis. It is the hypothesis that the researcher seeks to reject so that the hypothesis of interest can be accepted.