As atherosclerosis is the commonest cause of arteriosclerosis, the two terms are often used interchangeably. Arteriosclerotic heart disease (ASHD), also called coronary artery disease (CAD) or coronary heart disease (CHD), refers to arteriosclerosis of heart or coronary arteries.he most common form of arteriosclerosis is atherosclerosis, in which fat, cholesterol and other substances build up on the inner walls of arteries and form hard structures called plaques or atheromas, which can restrict blood flow.
home / study / math / statistics and probability / definitions / central limit theorem. The central limit theorem states that given a distribution with mean Î¼ and variance Ï2, the sampling distribution of the mean approaches a normal distribution with mean Î¼ and variance , where n is the number of samples.
It is natural that the means vary this much, for by the central limit theorem the means should have a normal distribution, regardless of the distribution of the samples themselves. The importance of knowing the natural process variation becomes clear when we apply statistical process control. In a stable process, the mean is on target; in the example, the target is the filling, set to 1 litre. The variation within the upper and lower control limits (UCL and LCL) is considered the natural variation of the process.