Spearmanâs rank correlation test is a test of significance based on Spearmanâs rank correlation coefficient (monotonic correlation between two ranked variables), which is carried out to detect the presence of heteroscedasticity. Assumptions of the test: Population correlation coefficent is 0.
N,N-Diethyl-meta-toluamide, also called DEET (/diËt/) or diethyltoluamide, is the most common active ingredient in insect repellents. It is a slightly yellow oil intended to be applied to the skin or to clothing, and provides protection against mosquitoes, ticks, fleas, chiggers, leeches, and many biting insects. 1 History.
DEET (N,N-diethyl-3-methylbenzamide) is a reliable and highly effective insect repellent. The chemical has been in public use since 1957. The repellent is sold under numerous brand names and comes in lotion, spray and many other forms.Concentrations of DEET range from about 5% all the way up to 100%.epellents, clothing, netting and other personal protection measures can help prevent mosquito bites and the diseases they carry. Insect repellents are effective and safe when properly used.