已选分类
管理学工商管理
单选题3x2+bx+c=0(c≠0)的两个根为α、β，如果α+β，β为根的一元二次方程是 3x2-bx+c=0，则b和c分别为( )．
单选题发展速度属于( )。 A．比例相对数 B．比较相对数 C．动态相对数 D．强度相对数
单选题若两个相互独立的随机变量X和Y的标准差分别为6与8，则(X+Y)的标准差为( )。 A．7 B．10 C．14 D．无法计算
单选题企业通过在新地区或国外增设新的商业网点或利用新的分销渠道，加大广告促销 力度等措施，在新市场上扩大现有产品销售，称为：( )
单选题During a 3-year period, the profits of Company X changed by what percent from the second year to the third year? (1)The increase in profits of Company X from the first year to the second year was the same as the increase from the first year to the third year. (2)For Company X, the profits for the first year were $13,800 and the profits for the third year were $15,900. (A) 条件(1)充分，但条件(2)不充分． (B) 条件(2)充分，但条件(1)不充分． (C) 条件(1)和(2)单独都不充分，但条件(1)和条件(2)联合起来充分． (D) 条件(1)充分，条件(2)也充分． (E) 条件(1)和条件(2)单独都不充分，条件(1)和条件(2)联合起来也不充分．
单选题财务指标中一般运用的价格是( )。 A．历史价格 B．现行价格 C．未来估价 D．变现价格
单选题A 20 percent decline in lobster catches in Maine waters since 1980 can be justifiably blamed on legislation passed in 1972 to protect harbor seals. Maine"s population of harbor seals is now double the level existing before protection was initiated, and these seals are known to eat both fish and lobsters.
Which of the following, if tree, would most seriously weaken the argument above?
单选题
单选题等级相关系数的取值范围是( )。 A．0≤rs≤1 B．rs≤0 C．-1≤rs≤1 D．不定
单选题用标准差比较分析两个同类总体平均指标的代表性的前提条件是( )。 A．两个总体的标准差应相等 B．两个总体的平均数应相等 C．两个总体的单位数应相等 D．两个总体的离差之和应相等
单选题在抽样设计中，最好的方案是( )。 A．抽样误差最小的方案 B．抽样单位最小的方案 C．调查费用最少的方案 D．在一定误差要求下费用最小的方案
单选题Medieval Arabs had manuscripts of many ancient Greek texts, which were translated into Arabic when there was a demand for them. Medieval Arab philosophers were very interested in Aristotle"s Poetics, an interest that evidently was not shared by medieval Arab poets, because a poet interested in the Poetics would certainly have wanted to read Homer, to whose epics Aristotle frequently refers. But Homer was not translated into Arabic until modern times.
Which one of the following, if true, most strongly supports the argument above?
单选题Theoperation*isdefinedasfollows：.Whatisthevalueof(6)*(4)?
单选题Thetableaboveshowsthecost,indollars,oftravelingtoandfromcitiesA,B,C,D,E,andF.AsalesrepresentativewantstoleavefromA,traveltoC,E,andF,andreturntoA.IfthefirstcitythatthesalesrepresentativetravelstomustbeE，whatistheminimumpossiblecostfortheentiretrip?
单选题If k and n are integers, is n divisible by 7? (1)n-3=2k (2)2k-4 is divisible by 7.
单选题下列各项因素引起的风险属于系统性风险的是( )。
单选题A study of the difference in earnings between men and women in the country of Naota found that the average annual earnings of women who are employed full time is 80 percent of the average annual earnings of men who are employed full time. However, other research consistently shows that, in Naota, the average annual earnings of all employed women is 65 percent of the average annual earnings of all employed men.
Which one of the following, if also established by research, most helps explain the apparent discrepancy between the research results described above?
单选题回归系数是 A．自变量和因变量之间关系的强度 B．自变量每变动一个单位时，因变量的平均变动值 C．因变量每变动一个单位时，自变量的平均变动值 D．变量之间的线性关系
单选题Census data for Prenland show that unmarried Prenlandic men in their thirties outnumber unmarried Prenlandic women in that age group by about ten to one. Most of these men do wish to marry. Clearly, however, unless many of them marry women who are not Prenlandic, all but a minority will remain unmarried.
The argument makes which of the following assumptions?
单选题One-fifthofthelightswitchesproducedbyacertainfactoryaredefective.Four-fifthsofthedefectiveswitchesarerejectedandofthenondefectiveswitchesarerejectedbymistake.Ifalltheswitchesnotrejectedaresold,whatpercentoftheswitchessoldbythefactoryaredefective?(A)4%(B)5%(C)6.25%(D)11%(E)16%