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【单选题】
数据统计方法中的t检验法可以用来判断数据间的差异是否属于显著性差异，其目的是检验测量中是否存在（），从而正确评价测定结果的可靠性。A.
系统误差
B.
随机误差
C.
标准偏差
D.
误差
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举一反三
【单选题】State and local government______the safety, structure, and appearance of the community through use of local law.
A.
regain
B.
recreate
C.
repute
D.
regulate
【单选题】Banks' asset portfolios include state and local government securities because
A.
they help to attract business from these government entities.
B.
banks consider them helpful in attracting accounts of Federal employees.
C.
the Federal Reserve requires member banks to buy securities from state and local governments located within their respective Federal Reserve districts.
D.
there is no default-risk with state and local government securities.
【单选题】随机选取列表['apple' , 'pear' , 'peach' , 'orange']中的1个字符串的Python代码是：
A.
from random import* sample(['apple' , 'pear' , 'peach' , 'orange'])
B.
from random import* choice(['apple' , 'pear' , 'peach' , 'orange'])
C.
from random import* ls = ['apple' , 'pear' , 'peach' , 'orange'] shuffle(ls)
D.
给出的选项都不正确
【简答题】什么是条件电极电位?为什么要引入条件电极电位?影响条件电极电位的因素有哪些?
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