【单选题】The cost associated with the difference between the standard hours and the actual hours of direct labor spent producing a commodity is called the: a. direct labor quantity variance b. direct labor volume variance c. direct labor rate variance d. direct labor time variance A. direct labor quantity variance B. direct labor volume variance C. direct labor rate variance D. direct labor time variance

Variance analysis include ( ) A: Schedule variance B: Cost variance C: The schedule performance index D: The cost performance index

The beta of a security is calculated by A: dividing the covariance of the security with the market by the variance of the market. B: dividing the correlation of the security with the market by the variance of the market. C: dividing the variance of the market by the covariance of the security with the market. D: dividing the variance of the market by the correlation of the security with the market.

The evaluation index of variance analysis in EVM include （ ）。 A: Schedule variance (SV) B: Cost performance index (CPI) C: Cost variance (CV) D: Project performance index (PPI)

The variance of a Poisson distribution is equal to _______.

5. What is the variance of C2?______

遗传方差（genetic variance）

The trend of the variance A: Yes B: No

Your politics ______ (seem) to be at variance with mine.

The term ‘variance’ of the method ‘Analysis of Variance’ means: . A: The method is to compare the difference of population variances B: The method is to compare the difference of sample variances C: The method requires that variances of different groups should be equal D: The method calculates MS and compares MS, while MS is variance in concept E: The method calculates SS and compares SS, while SS is variance in concept