IEE 380 Exam 1 practice test Questions and
Correct Answers
you are required to use a TI-89
False
graph of F(x) = P(X <= x) when X is the face value for the throw of a fair die?
x on x-axis
F(x) on y-axis
open step function for graph
The entry in the Z table (CDF of a standard normal random variable) corresponding to
a row label of 1.2 and a column label of .03 is
P(Z <= 1.23) / phi(1.23)
If random variable X has a/an _______________ number of values in a finite interval of
its range, X is continuous.
infinite
The CDF is the probability that a random variable, X, is _______________ to a specific
number, x.
less than or equal to
on a graph of the standard normal variable f(z) is on the y-axis
false, f(x)
, ******Let x (lowercase) denote a specific measured numerical value of a random
variable. How do we denote this random variable? That is, what is the notation of the
random variable?
P(X=x)
Open the text to section 3.6 and look at Example 3-16 Digital Channel. This example
was part of your reading assignment for the week.
Which of the following is the correct definition of the random variable in this example?
X is the random variable and it is the number of bits received in error out of the next four that
are transmitted.
******Suppose the pdf of X is given as f(x) = .25 for 3 < x < 8
How many numerical values can X be?
5
******How many values can a Poisson random variable have?
n
Let P(X=x) be the probability that a random variable equals a specific measured
numerical value, x.
Let p(x) denote the probability mass function of that random variable, X.
Is this relationship True or False: P(X=x) = p(x)
true
Correct Answers
you are required to use a TI-89
False
graph of F(x) = P(X <= x) when X is the face value for the throw of a fair die?
x on x-axis
F(x) on y-axis
open step function for graph
The entry in the Z table (CDF of a standard normal random variable) corresponding to
a row label of 1.2 and a column label of .03 is
P(Z <= 1.23) / phi(1.23)
If random variable X has a/an _______________ number of values in a finite interval of
its range, X is continuous.
infinite
The CDF is the probability that a random variable, X, is _______________ to a specific
number, x.
less than or equal to
on a graph of the standard normal variable f(z) is on the y-axis
false, f(x)
, ******Let x (lowercase) denote a specific measured numerical value of a random
variable. How do we denote this random variable? That is, what is the notation of the
random variable?
P(X=x)
Open the text to section 3.6 and look at Example 3-16 Digital Channel. This example
was part of your reading assignment for the week.
Which of the following is the correct definition of the random variable in this example?
X is the random variable and it is the number of bits received in error out of the next four that
are transmitted.
******Suppose the pdf of X is given as f(x) = .25 for 3 < x < 8
How many numerical values can X be?
5
******How many values can a Poisson random variable have?
n
Let P(X=x) be the probability that a random variable equals a specific measured
numerical value, x.
Let p(x) denote the probability mass function of that random variable, X.
Is this relationship True or False: P(X=x) = p(x)
true
