MATH 1280 Introduction to Statistics
UPDATED Questions and CORRECT
Answers
An automobile producing company operates car dealerships that sell its cars. In order to assess
the service costumers 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 were 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. - CORRECT ANSWER - Select the
correct answer in each of the following 4 questions:
The population in this survey is: - CORRECT ANSWER - a. The researchers that
conducted the survey.
b. Customers that arrive at dealerships of the company. CORRECT
c. The automobile producing company.
d. Owners of cars that are produced by the company.
The sample in this survey is: - CORRECT ANSWER - a. The team that conducted the
survey.
b. Customers that arrive at dealerships of the company.
c. "Yes", "No", or "Refuse to Answer".
d. Customers that arrive at the selected dealerships during the day of visit. CORRECT
A parameter that may be targeted by this survey is: - CORRECT ANSWER - a. The
percentage of costumers that possess a car made by the company. CORRECT
b. Customers that arrive at the selected dealerships during the day of visit.
c. "Yes", "No", or "Refuse to Answer".
, d. Owners of cars that are produced by the company.
A statistic that may be used to summarize the outcome of the survey is: - CORRECT
ANSWER - a. "Yes".
b. The percentage, among costumers that were interviewed, of those that do not possess a car
made by the company CORRECT
c. Customers that arrive at the selected dealerships during the day of visit.
d. The team that conducted the survey.
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. - CORRECT
ANSWER - In light of the description given above, and based on the tables and/or the
plots, select the correct answer in each of the following 6 questions:
The data used to produce the tables and plots is: - CORRECT ANSWER - a. A population.
b. A sample. CORRECT
c. A parameter.
d. A statistic.
UPDATED Questions and CORRECT
Answers
An automobile producing company operates car dealerships that sell its cars. In order to assess
the service costumers 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 were 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. - CORRECT ANSWER - Select the
correct answer in each of the following 4 questions:
The population in this survey is: - CORRECT ANSWER - a. The researchers that
conducted the survey.
b. Customers that arrive at dealerships of the company. CORRECT
c. The automobile producing company.
d. Owners of cars that are produced by the company.
The sample in this survey is: - CORRECT ANSWER - a. The team that conducted the
survey.
b. Customers that arrive at dealerships of the company.
c. "Yes", "No", or "Refuse to Answer".
d. Customers that arrive at the selected dealerships during the day of visit. CORRECT
A parameter that may be targeted by this survey is: - CORRECT ANSWER - a. The
percentage of costumers that possess a car made by the company. CORRECT
b. Customers that arrive at the selected dealerships during the day of visit.
c. "Yes", "No", or "Refuse to Answer".
, d. Owners of cars that are produced by the company.
A statistic that may be used to summarize the outcome of the survey is: - CORRECT
ANSWER - a. "Yes".
b. The percentage, among costumers that were interviewed, of those that do not possess a car
made by the company CORRECT
c. Customers that arrive at the selected dealerships during the day of visit.
d. The team that conducted the survey.
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. - CORRECT
ANSWER - In light of the description given above, and based on the tables and/or the
plots, select the correct answer in each of the following 6 questions:
The data used to produce the tables and plots is: - CORRECT ANSWER - a. A population.
b. A sample. CORRECT
c. A parameter.
d. A statistic.
