BANA Exam 2
The range of probability is
0-1
The union of events A and B is the event containing all the sample points belonging to
A or B or both
According to Perfect Payday, Jeffrey Rich was
CEO of Affiliated Computer Services
The standard deviation of a normal distribution
cannot be negative
The Statistics in Practice example in Chapter 4 is primarily concerned with
part failures
An experiment consists of four outcomes with P(E 1) = 0.2, P(E 2) = 0.3, and P(E 3) = 0.4. The probability of outcome E 4 is
0.100
If A and B are independent events with P(A) = 0.2 and P(B) = 0.6, then P(A union B) =
0.68
The number of customers that enter a store during one day is an example of
a discrete random variable
A normal distribution with a mean of 0 and a standard deviation of 1 is called
a standard normal distribution
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
The binomial probability distribution is used with a(n) _____ random variable
discrete
A random variable that can assume only a finite number of values is referred to as a(n)
discrete random variable
In a binomial experiment, the probability
does not change from trial to trial
What is a collection of sample points called?
event
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
A measure of the average value of a random variable is called a(n)
expected value
A continuous probability distribution that is useful in describing the time, or space, between occurrences of an event is a(n) _____ probability distribution.
exponential
The probability distribution that can be described by just one parameter is the
exponential
There is a lower limit but no upper limit for a random variable that follows the _____ probability distribution.
exponential
The _____ probability function is based in part on the counting rule for combinations.
hypergeometric
To compute the probability that in a random sample of n elements, selected without replacement, we will obtain x successes, we would use the _____ probability distribution.
hypergeometric
A sample point refers to the
individual outcome of an experiment
The symbol ∩ shows the
intersection of two events
A normal probability distribution
is a continuous probability distribution
The probability that a continuous random variable takes any specific value
is equal to zero
The center of a normal curve
is the mean of the distribution
When dealing with the number of occurrences of an event over a specified interval of time or space, the appropriate probability distribution is a _____ distribution.
poisson
Chapter 6 focuses on
probability distributions
The Statistics in Practice example in Chapter 6 identifies an application concerned with
raw materials prices
A method of assigning probabilities based upon judgment is referred to as the _____ method.
subjective
The probability of an event is the _____ of the probabilities of the sample points in the event.
sum
The highest point of a normal curve occurs at
the mean
A negative value of z indicates
the number of standard deviations an observation is to the left of the mean.
Bayes' theorem is used to compute
the posterior probabilities
The collection of all possible sample points in an experiment is
the sample space
The symbol ∪ shows the
union of events
The intersection of two mutually exclusive events
must always be equal to 0.
The company identified in Chapter 5, Statistics in Practice is
not a company but precinct polling locations
The counting rule that is used for counting the number of experimental outcomes when n objects are selected from a set of N objects where order of selection is important is called the counting rule for
permutations
In the textile industry, a manufacturer is interested in the number of blemishes or flaws occurring in each 100 feet of material. The probability distribution that has the greatest chance of applying to this situation is the
poisson distribution
The Statistics in Practice example in Chapter 5 focuses on
polling booths or machines
Initial estimates of the probabilities of events are known as _____ probabilities
prior
The function that defines the probability distribution of a continuous random variable is a
probability density function
chapter 5 focuses on
probability distributions
The key difference between the binomial and hypergeometric distribution is that, with the hypergeometric distribution, the
probability of success changes from trial to trial
A graphical method of representing the sample points of an experiment is a
tree diagram
Larger values of the standard deviation result in a normal curve that is
wider and flatter
In a standard normal distribution, what is the probability that z is greater than zero?
0.5
The company identified in Chapter 4, Statistics in Practice is
NASA
A decision maker subjectively assigned the following probabilities to the four outcomes of an experiment: P(E1) = 0.15, P(E2) = 0.05, P(E3) = 0.45, and P(E4) = 0.20. Are these probability assignments valid? Explain.
No, the probabilities do not sum to 1
What is the complement of P(A|B)?
P(AC|B)
Chapter 4 focuses on
Probabilty
A graphical representation in which the sample space is represented by a rectangle and events are represented as circles is called a
Venn diagram
The Poisson probability distribution is used with _____ random variable.
a discrete
The addition law is potentially helpful when we are interested in computing the probability of
the union of two events
If A and B are mutually exclusive events with P(A) = 0.295, P(B) = 0.32, then P(A | B) =
0.0000
According to the article in this Module, the probability of winning a prize at the in-store McDonald's Monopoly game was
0.25
The sum of the probabilities of two complementary events is
1.0
An experiment consists of three steps. There are four possible results on the first step, three possible results on the second step, and two possible results on the third step. The total number of experimental outcomes is
24
Which of the following is not a characteristic of the normal probability distribution?
99.72% of the time the random variable assumes a value within plus or minus 1 standard deviation of its mean
The z score for the standard normal distribution
can be either negative or positive
A normal probability distribution
can have a mean of any numerical value
Two events with nonzero probabilities
can not be both mutually exclusive and independent
When the assumption of equally likely outcomes is used to assign probability values, the method used to assign probabilities is referred to as the _____ method.
classical
The counting rule that is used for counting the number of experimental outcomes when n objects are selected from a set of N objects where order of selection is not important is called the rule for
combinations
Posterior probabilities are _____ probabilities.
conditional
The company identified in Chapter 6, Statistics in Practice is
proctor and gamble
A numerical description of the outcome of an experiment is called a
random variable
When the results of experimentation or historical data are used to assign probability values, the method used to assign probabilities is referred to as the _____ method.
relative frequency
If two events are independent, then
the product of their probabilities gives their intersection.
