Chapters 17 - 20 (Student)
1
Thinking About Chance
•
Chance behavior is unpredictable in the short
run but has a regular and predictable pattern
in the long run.
•
This is the basis for the idea of probability.
Randomness and Probability
•
A phenomenon is
random
if individual outcomes are
uncertain but there is a regular distribution of outcomes in a
large number of repetitions.
•
The
probability
of any outcome of a random phenomenon is
a number between 0 and 1 that describes the proportion of
times the outcome would occur in a very long series of
repetitions.
•
An impossible outcomes
has probability of 0.
•
A certain outcome
has probability of 1.
Types of Probability
•
An event
refers to a collection of outcomes.
•
Experimental Probability
– proportion of occurrences of a
particular event when an experiment is repeated several
times.
•
Theoretical Probability
– For equally likely outcomes,
outcomes
possible
of
#
occur
can
event
the
ways
of
#
)
(
=
event
P

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