It doesn’t matter whether the interviewee smiles or not during the phone interview, since the interviewer cannot see him/her.
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有关方差的说法正确的是（）
A. D（C）=C（C为常数）
B. D（CX）=D（X）
C. D（C+X）=D（X）（C为常数）
D. 方差就是期望。
已知离散型随机变量X服从二项分布，且期望E(x)=2.4,方差D(X)=2.16,则其参数n,p的值为（）
A. n=4,p=0.6
B. n=6,p=0.4
C. n=8,p=0.3
D. n=24,p=0.1
期望刻画了随机变量的平均水平，方差刻画了随机变量的离散程度。
A. 对
B. 错
What is a group interview?
A. It is done with a group of people.
B. It is a traditional one-on-one interview.
C. It is very economical and time-saving for interviewers.
D. It helps interviewers conduct an initial screening of the candidates as they observe the candidates’ behavior and interaction with each other.
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