application or intradermal injection of a substance to the skin to test the body's reaction to it. Such a test detects an animal's sensitivity to such allergens as dust and pollen, or to preparations of microorganisms believed to be the cause of a disorder.
A direct relationship graph is a graph where one variable either increases or decreases along with the other. The general equation for a direct relationship graph is y = mx + b, where y denotes the...
1 The greater the absolute value of a correlation coefficient, the stronger the linear relationship. 2  The strongest linear relationship is indicated by a correlation coefficient of -1 or 1.  The weakest linear relationship is indicated by a correlation coefficient equal to 0.