QBA COBA Core UPDATED ACTUAL
Exam Questions and CORRECT Answers
Which of the following is a discrete quantitative (numerical) variable?
a) The Dow Jones Industrial average
b) The volume of water released from a dam
c) The distance you drove yesterday.
d) The number of employees of an insurance company - CORRECT ANSWER - d) The
number of employees of an insurance company
Which of the following is a continuous quantitative (numerical) variable?
a) The color of a student's eyes
b) The number of employees of an insurance company
c) The amount of milk in a 2-liter carton.
d) The number of gallons of milk sold at the local grocery store yesterday - CORRECT
ANSWER - c) The amount of milk in a 2-liter carton
To monitor campus security, the campus police office is taking a survey of the number of
students in a parking lot each 30 minutes of a 24-hour period with the goal of determining when
patrols of the lot would serve the most students. If X is the number of students in the lot each
period of time, then X is an example of
a) a categorical variable
b) a discrete variable
c) a continuous variable
d) a statistic - CORRECT ANSWER - b) a discrete variable
,Researchers are concerned that the weight of the average American school child is increasing
implying, among other things, that children's clothing should be manufactured and marketed in
larger sizes. If X is the weight of school children sampled in a nationwide study, then X is an
example of
a) a categorical variable
b) a discrete variable
c) a continuous variable
d) a table of random numbers - CORRECT ANSWER - c) a continuous variable
The chancellor of a major university was concerned about alcohol abuse on campus and wanted
to find out the proportion of students at the university who visited campus bars on the weekend
before the final exam week. A random sample of 250 students was taken. The answer on
"whether you visited campus bars on the weekend before the final exam week" from students in
the sample is an example of .
a) a categorical variable
b) a discrete variable
c) a continuous variable
d) a table of random numbers - CORRECT ANSWER - a) a categorical variable
The portion of the universe that has been selected for analysis is called
a) a sample
b) a frame
c) a primary data source
d) a secondary data source - CORRECT ANSWER - a) sample
Which of the following is most likely a population as opposed to a sample?
,a) respondents to a newspaper survey
b) the first 5 students completing an assignment
c) every third person to arrive at the bank
d) registered voters in a county - CORRECT ANSWER - d) registered voters in a country
A study is underway in Yosemite National Forest to determine the adult height of American pine
trees. Specifically, the study is attempting to determine what factors aid a tree in reaching heights
greater than 60 feet tall. It is estimated that the forest contains 25,000 adult American pines. The
study involves collecting heights from 250 randomly selected adult American pine trees and
analyzing the results. Identify the population from which the study was sampled.
a) The 250 randomly selected adult American pine trees
b) The 25,000 adult American pine trees in the forest
c) All the adult American pine trees taller than 60 feet
d) All American pine trees, of any age, in the forest - CORRECT ANSWER - b) the
25,000 adult American pine trees in the forest
A study is under way in Yosemite National Forest to determine the adult height of American
pine trees. Specifically, the study is attempting to determine what factors aid a tree in reaching
heights greater than 60 feet tall. It is estimated that the forest contains 25,000 adult American
pines. The study involves collecting heights from 250 randomly selected adult American pine
trees and analyzing the results. Identify the sample in the study.
a) The 250 randomly selected adult American pine trees
b) The 25,000 adult American pine trees in the forest
c) All the adult American pine trees taller than 60 feet
d) All American pine trees, of any age, in the forest - CORRECT ANSWER - a) The 250
randomly selected adult American pine trees
Most analysts focus on the cost of tuition as the way to measure the cost of a college education.
But incidentals, such as textbook costs, are rarely considered. A researcher at Drummand
University wishes to estimate the textbook costs of first-year students at Drummand. To do so,
, she monitored the textbook cost of 250 first-year students and found that their average textbook
cost was $600 per semester. Identify the population of interest to the researcher.
a) All Drummand University students
b) All college students
c) All first-year Drummand University students
d) The 250 students that were monitored - CORRECT ANSWER - c) All first-year
Drummand University students
Most analysts focus on the cost of tuition as the way to measure the cost of a college education.
But incidentals, such as textbook costs, are rarely considered. A researcher at Drummand
University wishes to estimate the textbook costs of first-year students at Drummand. To do so,
she monitored the textbook cost of 250 first-year students and found that their average textbook
cost was $600 per semester. Identify the sample in the study.
a) All Drummand University students.
b) All college students.
c) All first-year Drummand University students.
d) The 250 students that were monitored. - CORRECT ANSWER - d) The 250 students
that were monitored
Which of the following is most likely a parameter as opposed to a statistic?
a) The average score of the first five students completing an assignment.
b) The proportion of females registered to vote in a county.
c) The average height of people randomly selected from a database.
d) The proportion of trucks stopped yesterday that were cited for bad brakes. - CORRECT
ANSWER - b) The proportion of females registered to vote in a country
The following are the duration in minutes of a sample of long-distance phone calls made within
the continental United States reported by one long-distance carrier.
Exam Questions and CORRECT Answers
Which of the following is a discrete quantitative (numerical) variable?
a) The Dow Jones Industrial average
b) The volume of water released from a dam
c) The distance you drove yesterday.
d) The number of employees of an insurance company - CORRECT ANSWER - d) The
number of employees of an insurance company
Which of the following is a continuous quantitative (numerical) variable?
a) The color of a student's eyes
b) The number of employees of an insurance company
c) The amount of milk in a 2-liter carton.
d) The number of gallons of milk sold at the local grocery store yesterday - CORRECT
ANSWER - c) The amount of milk in a 2-liter carton
To monitor campus security, the campus police office is taking a survey of the number of
students in a parking lot each 30 minutes of a 24-hour period with the goal of determining when
patrols of the lot would serve the most students. If X is the number of students in the lot each
period of time, then X is an example of
a) a categorical variable
b) a discrete variable
c) a continuous variable
d) a statistic - CORRECT ANSWER - b) a discrete variable
,Researchers are concerned that the weight of the average American school child is increasing
implying, among other things, that children's clothing should be manufactured and marketed in
larger sizes. If X is the weight of school children sampled in a nationwide study, then X is an
example of
a) a categorical variable
b) a discrete variable
c) a continuous variable
d) a table of random numbers - CORRECT ANSWER - c) a continuous variable
The chancellor of a major university was concerned about alcohol abuse on campus and wanted
to find out the proportion of students at the university who visited campus bars on the weekend
before the final exam week. A random sample of 250 students was taken. The answer on
"whether you visited campus bars on the weekend before the final exam week" from students in
the sample is an example of .
a) a categorical variable
b) a discrete variable
c) a continuous variable
d) a table of random numbers - CORRECT ANSWER - a) a categorical variable
The portion of the universe that has been selected for analysis is called
a) a sample
b) a frame
c) a primary data source
d) a secondary data source - CORRECT ANSWER - a) sample
Which of the following is most likely a population as opposed to a sample?
,a) respondents to a newspaper survey
b) the first 5 students completing an assignment
c) every third person to arrive at the bank
d) registered voters in a county - CORRECT ANSWER - d) registered voters in a country
A study is underway in Yosemite National Forest to determine the adult height of American pine
trees. Specifically, the study is attempting to determine what factors aid a tree in reaching heights
greater than 60 feet tall. It is estimated that the forest contains 25,000 adult American pines. The
study involves collecting heights from 250 randomly selected adult American pine trees and
analyzing the results. Identify the population from which the study was sampled.
a) The 250 randomly selected adult American pine trees
b) The 25,000 adult American pine trees in the forest
c) All the adult American pine trees taller than 60 feet
d) All American pine trees, of any age, in the forest - CORRECT ANSWER - b) the
25,000 adult American pine trees in the forest
A study is under way in Yosemite National Forest to determine the adult height of American
pine trees. Specifically, the study is attempting to determine what factors aid a tree in reaching
heights greater than 60 feet tall. It is estimated that the forest contains 25,000 adult American
pines. The study involves collecting heights from 250 randomly selected adult American pine
trees and analyzing the results. Identify the sample in the study.
a) The 250 randomly selected adult American pine trees
b) The 25,000 adult American pine trees in the forest
c) All the adult American pine trees taller than 60 feet
d) All American pine trees, of any age, in the forest - CORRECT ANSWER - a) The 250
randomly selected adult American pine trees
Most analysts focus on the cost of tuition as the way to measure the cost of a college education.
But incidentals, such as textbook costs, are rarely considered. A researcher at Drummand
University wishes to estimate the textbook costs of first-year students at Drummand. To do so,
, she monitored the textbook cost of 250 first-year students and found that their average textbook
cost was $600 per semester. Identify the population of interest to the researcher.
a) All Drummand University students
b) All college students
c) All first-year Drummand University students
d) The 250 students that were monitored - CORRECT ANSWER - c) All first-year
Drummand University students
Most analysts focus on the cost of tuition as the way to measure the cost of a college education.
But incidentals, such as textbook costs, are rarely considered. A researcher at Drummand
University wishes to estimate the textbook costs of first-year students at Drummand. To do so,
she monitored the textbook cost of 250 first-year students and found that their average textbook
cost was $600 per semester. Identify the sample in the study.
a) All Drummand University students.
b) All college students.
c) All first-year Drummand University students.
d) The 250 students that were monitored. - CORRECT ANSWER - d) The 250 students
that were monitored
Which of the following is most likely a parameter as opposed to a statistic?
a) The average score of the first five students completing an assignment.
b) The proportion of females registered to vote in a county.
c) The average height of people randomly selected from a database.
d) The proportion of trucks stopped yesterday that were cited for bad brakes. - CORRECT
ANSWER - b) The proportion of females registered to vote in a country
The following are the duration in minutes of a sample of long-distance phone calls made within
the continental United States reported by one long-distance carrier.
