IEE 380 quiz1 Question and answers
already passed 2025/2026
when successive observations of a system do not produce the same result, we have experienced ... -
correct answer ✔variability
An analyst for the engineering dean's office has decided to use existing freshman enrollment data for
2001 through 2017 to predict the freshman engineering enrollment for 2018. this situation may be
described as ... - correct answer ✔a retrospective study
which of the following uses historical data - correct answer ✔observational study
Tampering with a system or process usually results in an increase in ___ - correct answer ✔variability
Calls are repeatedly placed to a busy phone line until a connect is achieved. Let C = connect and b =
busy, select the correct sample space, S, below: - correct answer ✔S = {c, bc, bbc, bbbc, ...}
(True or False)- An experiment that can be repeated many times under the identical conditions yet have
different outcomes is called ___ - correct answer ✔random experiment
sample space are only discrete: true or false - correct answer ✔false
An event is a subset of the sample space of a random experiment: true or false - correct answer ✔true
the sample space of a random experiment contains all possible outcomes(true or false) - correct answer
✔true
, Orders for a computer are summarized by the option features that are requested. The proportion of
orders with no optional features is .21.The proportion of orders with one optional feature .21. the
proportion of orders with more than one optional feature is .58
a) what is the probability that an order requests at least one optional feature?
B) what is the probability that an order does not request more than one optional feature! - correct
answer ✔a).79
b).42
if P(A|B) = .048, P(B) = .73, and P(A) = .48, are the events B and the complement of A independent -
correct answer ✔yes
if we assumed that each throw of a fair die is independent, what is the probability of rolling a face value
of 6 on our 4th throw, given that we have rolled a 1 on the first throw, a 5 on the second throw, and a 3
on the third throw? - correct answer ✔(1/6)
two events A and B are independent with P(A) = P(B) = 0.5. the P( A ⏜ B ) is : - correct answer ✔0.25
If P(A|B) = .38, P(B) = 0.76., and P(A) = .42 , are the events of A and B independent - correct answer
✔no
A cell phone user selects apps to download. Each of 10 apps is independently selected with
probability .24
A) if each of the first 9 apps are downloaded, what is the probability that the last
B)what is the probability that the cell phone user downloads at least 3 apps
C)what is the probability that app 1 or 2 is downloaded - correct answer ✔a) .24
b) .44
(the complementary event for this question is that the cell phone user downloads no apps, or 1 app, or 2
apps. Let X denote the number of apps that are downloaded
since P( X = 0 ⏜ X = 1) = 0, P( X = 0 ⏜ X = 2) = 0 , P( X = 1 ⏜ X = 2) = 0,
already passed 2025/2026
when successive observations of a system do not produce the same result, we have experienced ... -
correct answer ✔variability
An analyst for the engineering dean's office has decided to use existing freshman enrollment data for
2001 through 2017 to predict the freshman engineering enrollment for 2018. this situation may be
described as ... - correct answer ✔a retrospective study
which of the following uses historical data - correct answer ✔observational study
Tampering with a system or process usually results in an increase in ___ - correct answer ✔variability
Calls are repeatedly placed to a busy phone line until a connect is achieved. Let C = connect and b =
busy, select the correct sample space, S, below: - correct answer ✔S = {c, bc, bbc, bbbc, ...}
(True or False)- An experiment that can be repeated many times under the identical conditions yet have
different outcomes is called ___ - correct answer ✔random experiment
sample space are only discrete: true or false - correct answer ✔false
An event is a subset of the sample space of a random experiment: true or false - correct answer ✔true
the sample space of a random experiment contains all possible outcomes(true or false) - correct answer
✔true
, Orders for a computer are summarized by the option features that are requested. The proportion of
orders with no optional features is .21.The proportion of orders with one optional feature .21. the
proportion of orders with more than one optional feature is .58
a) what is the probability that an order requests at least one optional feature?
B) what is the probability that an order does not request more than one optional feature! - correct
answer ✔a).79
b).42
if P(A|B) = .048, P(B) = .73, and P(A) = .48, are the events B and the complement of A independent -
correct answer ✔yes
if we assumed that each throw of a fair die is independent, what is the probability of rolling a face value
of 6 on our 4th throw, given that we have rolled a 1 on the first throw, a 5 on the second throw, and a 3
on the third throw? - correct answer ✔(1/6)
two events A and B are independent with P(A) = P(B) = 0.5. the P( A ⏜ B ) is : - correct answer ✔0.25
If P(A|B) = .38, P(B) = 0.76., and P(A) = .42 , are the events of A and B independent - correct answer
✔no
A cell phone user selects apps to download. Each of 10 apps is independently selected with
probability .24
A) if each of the first 9 apps are downloaded, what is the probability that the last
B)what is the probability that the cell phone user downloads at least 3 apps
C)what is the probability that app 1 or 2 is downloaded - correct answer ✔a) .24
b) .44
(the complementary event for this question is that the cell phone user downloads no apps, or 1 app, or 2
apps. Let X denote the number of apps that are downloaded
since P( X = 0 ⏜ X = 1) = 0, P( X = 0 ⏜ X = 2) = 0 , P( X = 1 ⏜ X = 2) = 0,
