建设工程施工合同形式繁多、特点各异，业主应综合考虑以下（）等因素，选择不同计价模式的

147 A process characteristic has a true mean of 150 and a true standard deviation of 20. A sample of 25 items is taken from this process. The standard error of the estimate is:

A. 0.2

B. 0.8

C. 4

D. 5

E. 7.5

29 A process characteristic has a true mean of 150 and a true standard deviation of 20. A sample of 25 items is taken from this process. The standard error of the estimate is:

A. 0.2

B. 0.8

C. 4

D. 5

E. 7.5

The centerline of a standard "Shewhart' control chart represents:

A . the process target

B . the nominal dimension specified by the customer

C . the nominal dimension specified by the designer

D . the true process average or mean

E . the process sample average or mean

187 The centerline of a standard "Shewhart' control chart represents:

A. the process target

B. the nominal dimension specified by the customer

C. the nominal dimension specified by the designer

D. the true process average or mean

E. the process sample average or mean

69 The centerline of a standard "Shewhart' control chart represents:

A. the process target

B. the nominal dimension specified by the customer

C. the nominal dimension specified by the designer

D. the true process average or mean

E. the process sample average or mean

A、Ergodicity is a notion of asymptotic independence.

B、A strictly stationary process that is ergodic is called ergodic stationary.

C、An important implication of ergodicity is that the statistical properties (such as the population mean and variance) of the ergodic time series process can be deduced from a single, sufficiently long sample (realization) of the process.

D、All of the above.

and a standard deviation of 14 percent. Stock B has a mean annual return of 20 percent and a standard deviation of 30 percent. Calculate the coefficient of variation (CV) of each stock. Which of the following statements is TRUE？

A.Stock A (CV = 0.875) has more dispersion relative to the mean than stock B.

B.Stock A (CV = 0.875) has less dispersion relative to the mean than stock B.

C.Stock A (CV 1.14) has more dispersion relative to the mean than stock B.

D.Stock A (CV 1.14) has less dispersion relative to the mean than stock B.

25 For a given characteristic in a construction process, the standard deviation associated with production variation is 0.8", and the standard deviation associated with measurement variation is 0.6". The total standard deviation for this characteristic is:

A. 1.4"

B. 1.2".

C. 1.0"

D. 0.8"

E. 0.2"