CH. 4 Probability

Bayes' theorem is calculated by using what rule in the denominator?

the probability rule

The ___ probability rule is a useful tool for breaking the computation of a probability into distinct cases.

total

In order to convert a contingency table into a joint probability table, the frequency of each cell is divided by the

total number of outcomes in the sample space.

Contingency tables are useful to analyze

two categorical variables

Unconditional probabilities are also known as ____ probabilities

marginal

When updating a prior probability based on new information, which of the following methodologies is MOST useful?

Bayes theorem

The original probability is an unconditional probability called a _____ probability

Marginal

On the basis of new information, we update the prior probability to arrive at a conditional probability called a ____ probability

Posterior probability

Which method can be used to help implement the total probability rule?

Probability table

True or false: When constructing a joint probability table, the cell in the lower right corner must always equal 1.0.

True

The total probability rule is used to compute an unconditional probability of an event by using...

conditional probabilities

For hotels in New York City, a travel web site wants to provide information comparing hotel costs (high, average, low) versus the quality ranking of the hotel (excellent, good, fair, poor). A useful way to summarize these data is to construct a(n) Multiple choice question.

contingency table

In a contingency table, joint probabilities represent the _____ of two events.

intersection

The values in the interior of a contingency table represent____probabilities

joint