IEE 380 Midterm 1 Exam Questions with Correct Answers Latest Update 2025-2026
Engineers need to have a working knowledge of statistics because many aspects of engineering
involve working with - Answers ANS: data
When successive observations of a system do not produce the same result, we have
experienced - Answers ANS: Variability
A dot diagram is useful for - Answers * Seeing features of small data sets
* Finding the location or middle of the data
* Comparing two small data sets
* Seeing the variability in the data
An analyst for the engineering dean's office has decided to use existing freshman enrolllment
data from 2001 through 2017 to predict
the freshman engineering enrollment for 2018. This situation may be described as - Answers A
retrospective study
Which of the following uses historical data? - Answers retrospective study
When we collect data by observing a population or process without disturbing it, we are
conducting a(an) - Answers observational study
Tampering with a system or process usually resu Its in an increase in - Answers Variability
An experiment that can be repeated many times under identical conditions yet have different
outcomes is called a random experiment. - Answers True
Sample spaces are only discrete. - Answers False
An event is a subset of the sample space of a random experiment. - Answers True
The sample space of a random experiment contains all of the possible outcomes. - Answers
True
A random variable is said to be discrete if it has an infinite number of values in
a finite interval of its range. - Answers False
A random variable is a function that assigns a probability to each outcome in
the sample space of a random experiment. - Answers False
The combination rule determines the number of ways a selection of a: items
, from a set of n available items can happen if we assume order does not
matter. - Answers True
If Event A and Event B are independent, which of the following is true? - Answers The
occurrence of A does not affect the probability of B occurring.
If "(A I B) = 0.46, P(B) = 0.75, and P(A) = 0.46, are the events B and the complement of A
independent? - Answers Yes
The denominator of Bayes' Theorem uses the - Answers Total probability rule
Bayes' theorem states that P(A I B) = (P(B|A)P(A))/(P(B)) - Answers true
P(A|B) + P(A'|B) = - Answers 1
P(BIA) and P(BIA') are both probabilities about - Answers Event B
Let C be the event that a student received a grade of B or better in Calculus I and let S be event
that a student received a grade of A in
Statistics l. Which of the following denotes the probability that a student received an A in
statistics given that the student received less
than a B grade in Calculus l. - Answers P(S|C')
Decide whether a discrete or continuous random variable is the best model for each of the
following variables:
(a) The time for a computer algorithm to assign an image to a category.
(b) The number of bytes used to store a file in a computer.
(c) The ozone concentration in micrograms per cubic meter.
(d) The ejection fraction (volumetric fraction of blood pumped from a heart ventricle with each
beat).
(e) The fluid flow rate in liters per minute. - Answers a.) Continuous
b.) Discrete, but large values might be modeled as continuous
Engineers need to have a working knowledge of statistics because many aspects of engineering
involve working with - Answers ANS: data
When successive observations of a system do not produce the same result, we have
experienced - Answers ANS: Variability
A dot diagram is useful for - Answers * Seeing features of small data sets
* Finding the location or middle of the data
* Comparing two small data sets
* Seeing the variability in the data
An analyst for the engineering dean's office has decided to use existing freshman enrolllment
data from 2001 through 2017 to predict
the freshman engineering enrollment for 2018. This situation may be described as - Answers A
retrospective study
Which of the following uses historical data? - Answers retrospective study
When we collect data by observing a population or process without disturbing it, we are
conducting a(an) - Answers observational study
Tampering with a system or process usually resu Its in an increase in - Answers Variability
An experiment that can be repeated many times under identical conditions yet have different
outcomes is called a random experiment. - Answers True
Sample spaces are only discrete. - Answers False
An event is a subset of the sample space of a random experiment. - Answers True
The sample space of a random experiment contains all of the possible outcomes. - Answers
True
A random variable is said to be discrete if it has an infinite number of values in
a finite interval of its range. - Answers False
A random variable is a function that assigns a probability to each outcome in
the sample space of a random experiment. - Answers False
The combination rule determines the number of ways a selection of a: items
, from a set of n available items can happen if we assume order does not
matter. - Answers True
If Event A and Event B are independent, which of the following is true? - Answers The
occurrence of A does not affect the probability of B occurring.
If "(A I B) = 0.46, P(B) = 0.75, and P(A) = 0.46, are the events B and the complement of A
independent? - Answers Yes
The denominator of Bayes' Theorem uses the - Answers Total probability rule
Bayes' theorem states that P(A I B) = (P(B|A)P(A))/(P(B)) - Answers true
P(A|B) + P(A'|B) = - Answers 1
P(BIA) and P(BIA') are both probabilities about - Answers Event B
Let C be the event that a student received a grade of B or better in Calculus I and let S be event
that a student received a grade of A in
Statistics l. Which of the following denotes the probability that a student received an A in
statistics given that the student received less
than a B grade in Calculus l. - Answers P(S|C')
Decide whether a discrete or continuous random variable is the best model for each of the
following variables:
(a) The time for a computer algorithm to assign an image to a category.
(b) The number of bytes used to store a file in a computer.
(c) The ozone concentration in micrograms per cubic meter.
(d) The ejection fraction (volumetric fraction of blood pumped from a heart ventricle with each
beat).
(e) The fluid flow rate in liters per minute. - Answers a.) Continuous
b.) Discrete, but large values might be modeled as continuous
