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QBA Stone Chapters 5- Quizzes
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Terms in this set (27)
Chapter 4
...
The sum of the probabilities of two complementary events is
1
Events that have no sample points in common are
mutually exclusive events
Events A and B are mutually exclusive if their joint probability is
0
The intersection of two mutually exclusive events
must always be equal to 0
Two events with nonzero probabilities
can not be both mutually exclusive and independent
find more chapter 4 questions on quizlet
...
A numerical description of the outcome
of an experiment is called a?
random variable
A random variable that can assume only
a finite number of values is referred to as a(n)?
discrete random variable
A probability distribution showing the
probability of x successes in n trials, where the probability of success does not change from trial to trial, is termed a?
binomial probability distribution
Variance is?
a measure of the dispersion of a random
variable
A continuous random variable may assume?
any value in an interval or collection of
intervals
A description of the distribution of the
values of a random variable and their associated probabilities is called a?
probability distribution
Which of the following is a required condition
for a discrete probability function?
(Sigma) f(x) = 1
A measure of the average value of a random
variable is called a(n)?
expected value
The standard deviation is the?
positive square root of the variance
The variance is a measure of dispersion or
variability of a random variable. It is a weighted average of the?
squared deviations from the mean
A weighted average of the value of a random
variable, where the probability function provides weights is known as?
the expected value
An experiment consists of making 80
telephone calls in order to sell a particular insurance policy. The random variable in this experiment is a?
discrete random variable
An experiment consists of determining the speed of
automobiles on a highway by the use of radar equipment. The random variable in this experiment is a?
continuous random variable
The number of customers that enter a store
during one day is an example of?
a discrete random variable
The weight of an object is an example of?
a continuous random variabl
Which of the following statements about a discrete
random variable and its probability distribution are true?
Values of f(x) must be greater than or equal to
zero.
The expected value of a discrete random variable?
is the average value for the random variable over
many repeats of the experiment
Which of the following is a characteristic of an experiment where the binomial probability distribution is applicable?
exactly two outcomes are possible on each trial
When sampling without replacement, the probability of obtaining a certain sample is best given by a?
hypergeometric distribution
Which of the following is not a required condition for a discrete probability function?
Sigma(x) = 0 for all values of x
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