MATH 1280: Introduction to Statistics/ Qs with
Certified Ans/ 2024-2025
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 correct answer in each of the following 4 questions: - Answer: The population in this
survey is:
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.
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, The sample in this survey is: - Answer: B) Customers that arrive at the selected dealerships
during the day of visit.
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.
"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.
"The percentage, among costumers that were interviewed, of those that do not possess a car
made by the company" is the only answer that describes a characteristic of the sample. The
third answer describes the sample, not a characteristic of it: The percentage of the subset
within the 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:
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Certified Ans/ 2024-2025
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 correct answer in each of the following 4 questions: - Answer: The population in this
survey is:
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.
Page 1 of 10
, The sample in this survey is: - Answer: B) Customers that arrive at the selected dealerships
during the day of visit.
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.
"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.
"The percentage, among costumers that were interviewed, of those that do not possess a car
made by the company" is the only answer that describes a characteristic of the sample. The
third answer describes the sample, not a characteristic of it: The percentage of the subset
within the 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:
Page 2 of 10
