MAT K167 Chapter Notes - Chapter 3: Frequency Distribution, Percentile, Standard Score
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X = ( f * x)/ f: calculating a weighted mean a) Important properties of standard deviation: the standard deviation is a measure of how much data values deviate away from the mean, the value of the standard deviation s is never negative. , which means that values of the sample stand deviation s do not center around the value of " Range rule of thumb for identifying signi cant values: signi cantly low values are " 2 or lower: signi cantly high values are " + 2 or higher: values are not signi cant: between " ( 2 ) an d ( + 2 ) Standard deviation of a population: population standard deviation " N: variance of a sample and a population, the variance of a set of values is a measure of variation equal to the square of the standard deviation, sample variance s2 = square of the standard deviation s.
