本题考查方差与平均数的计算,求出平均数,然后利用方差计算公式求解即可.【解答】解: 由已知有数据的平均数为 ¯x= (1+2+3+4+5)5=3 ,所以方差S^2= ((1-3)^2+(2-3)^2+(3-3)^2+(4-3)^2+(5-3)^2)5=2 .故选D.反馈 收藏
What is the variance? States of the Economy:The economy can pass through different stages called economic states. These stages can range from an economic boom to a total depression. The state of the economy affects the expected return on most investments....
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. What is the variance? Variance:The standard deviation and the variance are the measures of dispersion. The standard deviation is a square root of the variance. The standard deviation is a best measure of the standard deviation of the distri...
then divide by the degrees of freedom, either 5 if it's from the population or 4 if from a sample to get the variance 17.2/5 = 3.44 or 17.2/4 = 4.3 if a, b, c and d are your only choices, c is the "best" or closest to correct answer standard devi...
Gray is more frequent in American English, whereas grey is more common in British English. Learn more differences. But there is a gray area.
The materials usage variance or materials quantity variance is associated with a standard costing system. This variance results when the actual quantity of materials used is different from the quantity of materials that should have been used to make the good output. In other words, the actual quan...
The variable p is the proportion rather than percentage: .5 rather than 50% (and 0 rather than 0%; .01 rather than 1%; .1 rather than 10%; and 1 rather than 100%). The p * (1 – p) term in the numerator is called theproportion variance. ...
Definition of Variance Analysis In accounting, a variance is the difference between an actual amount and a budgeted, planned or past amount. Variance analysis is one step in the process of identifying and explaining the reasons for different outcomes. Variance analysis is usually associated with a ...
Variance is a statistical measurement of the spread between numbers in a data set. It measures how far each number in the set is from themean(average), and thus from every other number in the set. Variance is often depicted by this symbol: σ2. It is used by both analysts and traders...