商务统计学章节测试课后答案2024春

第四章测试

1.A process that produces outcomes is called _______.
A:population equivalent B:an event C:an experiment D:a result
答案:C
2.Which of the following is NOT a legitimate probability value?
A:0.23 B:0.67 C:4/3 D:15/16 3.An outcome of an experiment is called _______.
A:a priori elements B:an event C:a probability D:a complement 4.The list of all elementary events for an experiment is called _______.
A:the exhaustive list B:the population space C:the event union D:the sample space 5.If A and B are mutually exclusive events with P(A) = 0.70, then P(B)：（ ）
A:cannot be determined from the information given B:can take any value between 0 and 0.70 C:cannot be larger than 0.30 D:can take any value between 0 and 1 6.If an event is in set X but is not in set Y, which of the following is true?
A:it is in the union of X and Y B:it is in both the union and intersection of X and Y C:it is not in the union of X and Y D:it is in the intersection of X and Y 7.If the occurrence of one event does not affect the occurrence of another event, then the two events are _______.
A:mutually exclusive B:elementary events C:independent D:complements 8.Let A be the event that a student is enrolled in an accounting course, and let S be the event that a student is enrolled in a statistics course. It is known that 30% of all students are enrolled in an accounting course and 40% of all students are enrolled in statistics. Included in these numbers are 15% who are enrolled in both statistics and accounting. Find P(S).
A:0.15 B:0.30 C:0.55 D:0.40 9.Given P(A) = 0.40, P(B) = 0.50, P(A  B) = 0.15. Which of the following is true?
A:A and B are collectively exhaustive B:A and B are not independent C:A and B are mutually exclusive D:A and B are independent 10.Meagan Davies manages a portfolio of 200 common stocks. Her staff classified the portfolio stocks by ‘industry sector’ and ‘investment objective’. InvestmentIndustry SectorObjectiveElectronicsAirlinesHealthcareTotalGrowth1001040150Income20201050Total1203050200 Which of the following is NOT true?
A:Electronics and Healthcare are mutually exclusive. B:Airlines and Healthcare are collectively exhaustive. C:Growth and Income are complementary events. D:Electronics and Growth are dependent.