标题: Reading 8: Probability Concepts-LOS g习题精选 [打印本页]
作者: bmaggie 时间: 2010-4-12 14:20 标题: [2010]Session 2:-Reading 8: Probability Concepts-LOS g习题精选
Session 2: Quantitative Methods: Basic Concepts
Reading 8: Probability Concepts
LOS g: Distinguish between dependent and independent events
If X and Y are independent events, which of the following is most accurate?
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A) |
P(X or Y) = (P(X)) × (P(Y)). | |
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C) |
P(X or Y) = P(X) + P(Y). | |
作者: bmaggie 时间: 2010-4-12 14:21
If X and Y are independent events, which of the following is most accurate?
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A) |
P(X or Y) = (P(X)) × (P(Y)). | |
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|
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C) |
P(X or Y) = P(X) + P(Y). | |
Note that events being independent means that they have no influence on each other. It does not necessarily mean that they are mutually exclusive. Accordingly, P(X or Y) = P(X) + P(Y) ? P(X and Y). By the definition of independent events, P(X|Y) = P(X).
作者: bmaggie 时间: 2010-4-12 14:45
A company says that whether it increases its dividends depends on whether its earnings increase. From this we know:
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A) |
P(earnings increase | dividend increase) is not equal to P(earnings increase). | |
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B) |
P(both dividend increase and earnings increase) = P(dividend increase). | |
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C) |
P(dividend increase | earnings increase) is not equal to P(earnings increase). | |
作者: bmaggie 时间: 2010-4-12 14:45
A company says that whether it increases its dividends depends on whether its earnings increase. From this we know:
|
A) |
P(earnings increase | dividend increase) is not equal to P(earnings increase). | |
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B) |
P(both dividend increase and earnings increase) = P(dividend increase). | |
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C) |
P(dividend increase | earnings increase) is not equal to P(earnings increase). | |
If two events A and B are dependent, then the conditional probabilities of P(A | B) and P(B | A) will not equal their respective unconditional probabilities (of P(A) and P(B), respectively). Both remaining choices may or may not occur, e.g., P(A | B) = P(B) is possible but not necessary.
作者: bmaggie 时间: 2010-4-12 14:45
If the outcome of event A is not affected by event B, then events A and B are said to be:
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A) |
statistically independent. | |
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B) |
conditionally dependent. | |
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作者: bmaggie 时间: 2010-4-12 14:46
If the outcome of event A is not affected by event B, then events A and B are said to be:
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A) |
statistically independent. | |
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B) |
conditionally dependent. | |
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If the outcome of one event does not influence the outcome of another, then the events are independent.
作者: zaestau 时间: 2010-4-26 23:31
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