Reading 8: Probability Concepts-LOS d 习题精选

Session 2: Quantitative Methods: Basic Concepts
Reading 8: Probability Concepts

LOS d: Distinguish between unconditional and conditional probabilities.

Let A and B be two mutually exclusive events with P(A) = 0.40 and P(B) = 0.20. Therefore:

A)	P(A and B) = 0.

B)	P(B\|A) = 0.20.

C)	P(A and B) = 0.08.

If the two evens are mutually exclusive, the probability of both ocurring is zero.

2^#

发表于 2011-3-1 15:12 | 只看该作者

For a given corporation, which of the following is an example of a conditional probability? The probability the corporation's:

A)	earnings increase and dividend increases.

B)	inventory improves.

C)	dividend increases given its earnings increase.

A conditional probability involves two events. One of the events is a given, and the probability of the other event depends upon that given.

3^#

发表于 2011-3-1 15:12 | 只看该作者

For an unconditional probability:

A)	there are at least two events.

B)	there is only one random variable of concern.

C)	the addition rule is important.

An unconditional probability gives the probability of an event regardless of what other events occur.