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Chapter 17
Probability Models
ActivStats:
17
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Chapter 17
A
Bernoulli trial
= a random experiment with two
complementary events
success (S)
and
failure (F).
P(
success
) = p
P(
failure
) = q = 1  p
Bernoulli trials =
independent repetitions of a Bernoulli trial
Examples:
1.
Tossing a coin 20 times,
success =
Heads, p = 0.5,
q = 0.5, n = 20
2.
Rolling a die 10 times,
success =
six, p = 1/6, q = 5/6,
n = 10
3.
Taking multiple choice (choice AE) exam unprepared,
success =
correct answer, p = 1/5, n is a number of
questions
4.
Products coming out of production line,
success =
defective item, p = proportion of defectives
5.
Buying 10 boxes of cereal,
success
= box contains
Tiger Woods picture, p = 0.20 (assume that there is
20% chance that a box of cereal contains the Tiger
Woods picture), n = 10
6.
Selecting a sample of 100 students and counting
graduate students,
success =
graduate student, p =
proportion of graduate students on a campus, n=100
NOTE: If we select a sample without replacement then trials
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This note was uploaded on 07/25/2008 for the course STT 200 taught by Professor Dikong during the Summer '08 term at Michigan State University.
 Summer '08
 dikong

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