FTP, in statistics, this is a measure of the spread of values in a random variable or a probability distribution.
A set of corporate practices developed by Motorola and practiced by 3M and Raytheon, among others, is named for this, implying exceptional quality and almost no manufacturing defects. The so-called empirical rule, or 68-95-99.7 rule, relates area to distance, which is expressed in terms of this quantity. The z-score is computed by subtracting mu from the individual raw score, then dividing the difference by this (*) number, in a process known as normalization. For the Wechsler IQ test it is 15, while for the Stanford-Binet it is 16. It is the root mean square of the differences between each data point and the arithmetic mean. Also defined as the square root of the variance, it is denoted by the Greek letter sigma. FTP, in statistics, this is a measure of the spread of values in a random variable or a probability distribution.
A set of corporate practices developed by Motorola and practiced by 3M and Raytheon, among others, is named for this, implying exceptional quality and almost no manufacturing defects.
{standard deviation} (prompt on “{sigma}” before it is mentioned and prompt on "{six sigma}" before "{empirical rule}")