MATH 1280: Introduction to Statistics Exam | Verified Exam Questions
and Answers | Latest Updated Study Material 2026
Question:
MATH 1280: Introduction to Statistics Exam |
An automobile producing company operates car dealerships that sell its cars. In order to assess
the service customers get at the dealerships, a team from the Customer Relationship Department
was assembled. The team was sent to 20 randomly selected dealerships. Each dealership was
visited once by the team for an entire working day. During a visit, the team interviewed all the
customers that arrived at that dealership.
One of the questions that each of the customers was asked is: "Do you currently possess a car
made by our company?" The answers were marked down as "Yes", "No", or "Refuse to
Answer", depending on the customer's response.
Select the
Answer:
in each of the following 4 questions:
Question:
in each of the following 4 questions:
Answer:
The population in this survey is:
Question:
B) Customers that arrive at dealerships of the company.
The target of the survey is to assess the service that customers get at the dealerships.
The sample in this survey is:
Answer:
B) Customers that arrive at the
selected dealerships during the day of visit.
Question:
All the customers that arrive at dealerships are the population. The subset of those that arrive at
the 20 dealerships that were selected is the sample.
A parameter that may be targeted by this survey is:
, Answer:
A) The
percentage of customers that possess a car made by the company.
Question:
"The percentage of customers that possess a car made by the company" is the only answer that
describes a characteristic of the population. The last answer describes a subset of the population,
not a characteristic: The percentage of the subset within the entire population is a parameter, the
subset itself is not.
A statistic that may be used to summarize the outcome of the survey is:
Answer:
B) The percentage, among costumers that were interviewed, of those that do
not possess a car made by the company.
Question:
"The percentage, among costumers that were interviewed, of those that do not possess a car
sample is a statistic, the sample itself is not.
The Customers Service Center of a large bank receive calls from customers. The number of
incoming calls between 8:00 AM and 8:10 AM in consecutive days were recorded. The number
of incoming calls during the working days of the month of September were:
8, 10, 6, 7, 12, 7, 8, 7, 8, 6, 9, 4, 6, 14, 10, 10, 10, 10, 6, 10, 12, 7
The number of incoming calls during the working days of the month of February were:
9, 11, 14, 6, 4, 6, 7, 3, 3, 2, 5, 6, 6, 5, 6, 7, 5, 4, 3, 5.
Create two R objects, one by the name "Sep", and the other by the name "Feb". The first object
should contain the first data and the second object should contain the second data. Produce a
frequency table (with the function "table") for each of the objects and a bar plot (with the
combination of the function "plot" and the function "table"). For comparison, bar plots like the
one you should obtain are presented in Figure 1.6. and Figure 1.7.
In light of
Answer:
The data used to produce the tables and plots is:
Question:
C) A sample.
The meaning of deciding that the given information is a population is that one's target in the
investigation of number of arriving calls is only with respect to the specific dates and times that
and Answers | Latest Updated Study Material 2026
Question:
MATH 1280: Introduction to Statistics Exam |
An automobile producing company operates car dealerships that sell its cars. In order to assess
the service customers get at the dealerships, a team from the Customer Relationship Department
was assembled. The team was sent to 20 randomly selected dealerships. Each dealership was
visited once by the team for an entire working day. During a visit, the team interviewed all the
customers that arrived at that dealership.
One of the questions that each of the customers was asked is: "Do you currently possess a car
made by our company?" The answers were marked down as "Yes", "No", or "Refuse to
Answer", depending on the customer's response.
Select the
Answer:
in each of the following 4 questions:
Question:
in each of the following 4 questions:
Answer:
The population in this survey is:
Question:
B) Customers that arrive at dealerships of the company.
The target of the survey is to assess the service that customers get at the dealerships.
The sample in this survey is:
Answer:
B) Customers that arrive at the
selected dealerships during the day of visit.
Question:
All the customers that arrive at dealerships are the population. The subset of those that arrive at
the 20 dealerships that were selected is the sample.
A parameter that may be targeted by this survey is:
, Answer:
A) The
percentage of customers that possess a car made by the company.
Question:
"The percentage of customers that possess a car made by the company" is the only answer that
describes a characteristic of the population. The last answer describes a subset of the population,
not a characteristic: The percentage of the subset within the entire population is a parameter, the
subset itself is not.
A statistic that may be used to summarize the outcome of the survey is:
Answer:
B) The percentage, among costumers that were interviewed, of those that do
not possess a car made by the company.
Question:
"The percentage, among costumers that were interviewed, of those that do not possess a car
sample is a statistic, the sample itself is not.
The Customers Service Center of a large bank receive calls from customers. The number of
incoming calls between 8:00 AM and 8:10 AM in consecutive days were recorded. The number
of incoming calls during the working days of the month of September were:
8, 10, 6, 7, 12, 7, 8, 7, 8, 6, 9, 4, 6, 14, 10, 10, 10, 10, 6, 10, 12, 7
The number of incoming calls during the working days of the month of February were:
9, 11, 14, 6, 4, 6, 7, 3, 3, 2, 5, 6, 6, 5, 6, 7, 5, 4, 3, 5.
Create two R objects, one by the name "Sep", and the other by the name "Feb". The first object
should contain the first data and the second object should contain the second data. Produce a
frequency table (with the function "table") for each of the objects and a bar plot (with the
combination of the function "plot" and the function "table"). For comparison, bar plots like the
one you should obtain are presented in Figure 1.6. and Figure 1.7.
In light of
Answer:
The data used to produce the tables and plots is:
Question:
C) A sample.
The meaning of deciding that the given information is a population is that one's target in the
investigation of number of arriving calls is only with respect to the specific dates and times that
