MATH 1280 Final Actual Exam Questions
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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 the 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.
Select the correct answer in each of the following 4 questions:
Question 1
Correct
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The population in this survey is:
Select one:
a. The researchers that conducted the survey.
b. Customers that arrive at dealerships of the company.
c. The automobile producing company.
d. Owners of cars that are produced by the company.
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The correct answer is: Customers that arrive at dealerships of the company.
Question 2
Correct
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The sample in this survey is:
Select one:
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.
,Feedback
The correct answer is: Customers that arrive at the selected dealerships during the day of visit.
Question 3
Correct
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A parameter that may be targeted by this survey is:
Select one:
a. The percentage of costumers that possess a car made by the company.
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.
Feedback
The correct answer is: The percentage of costumers that possess a car made by the company.
Question 4
Correct
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A statistic that may be used to summarize the outcome of the survey is:
Select one:
a. Chi-Square
b. Percentage
c. T-Test
d. Anova
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The correct answer is: Percentage
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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 the description given above, and based on the tables and/or the plots, select the
correct answer in each of the following 6 questions:
Question 5
Correct
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The data used to produce the tables and plots is:
Select one:
a. A population.
b. A sample.
c. A parameter.
d. A statistic.
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The correct answer is: A sample.
Question 6
Correct
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The average number of calls that arrived between 8:00 AM and 8:10 AM during the working
days of all months is:
Select one:
a. A population.
b. A sample.
c. A parameter.
d. A statistic.
Feedback
The correct answer is: A parameter.
Question 7
Correct
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The average number of calls recorded in the object "Feb" is 5.85. The average in the object
"Sep" is 8.5. The difference between these two numbers is:
Select one:
a. A population.
b. A sample.
c. A statistic.
d. None of the above.
Feedback
The correct answer is: A statistic.
Question 8
Correct
Mark 1.00 out of 1.00
With Reviewed 100% Correct Detailed
Answers & Rationales
Guaranteed Pass!!
Information
Flag question
Information text
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 the 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.
Select the correct answer in each of the following 4 questions:
Question 1
Correct
Mark 1.00 out of 1.00
Flag question
Question text
The population in this survey is:
Select one:
a. The researchers that conducted the survey.
b. Customers that arrive at dealerships of the company.
c. The automobile producing company.
d. Owners of cars that are produced by the company.
Feedback
The correct answer is: Customers that arrive at dealerships of the company.
Question 2
Correct
Mark 1.00 out of 1.00
Flag question
Question text
The sample in this survey is:
Select one:
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.
,Feedback
The correct answer is: Customers that arrive at the selected dealerships during the day of visit.
Question 3
Correct
Mark 1.00 out of 1.00
Flag question
, Question text
A parameter that may be targeted by this survey is:
Select one:
a. The percentage of costumers that possess a car made by the company.
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.
Feedback
The correct answer is: The percentage of costumers that possess a car made by the company.
Question 4
Correct
Mark 1.00 out of 1.00
Flag question
Question text
A statistic that may be used to summarize the outcome of the survey is:
Select one:
a. Chi-Square
b. Percentage
c. T-Test
d. Anova
Feedback
The correct answer is: Percentage
Information
Flag question
Information text
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 the description given above, and based on the tables and/or the plots, select the
correct answer in each of the following 6 questions:
Question 5
Correct
Mark 1.00 out of 1.00
, Flag question
Question text
The data used to produce the tables and plots is:
Select one:
a. A population.
b. A sample.
c. A parameter.
d. A statistic.
Feedback
The correct answer is: A sample.
Question 6
Correct
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Question text
The average number of calls that arrived between 8:00 AM and 8:10 AM during the working
days of all months is:
Select one:
a. A population.
b. A sample.
c. A parameter.
d. A statistic.
Feedback
The correct answer is: A parameter.
Question 7
Correct
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The average number of calls recorded in the object "Feb" is 5.85. The average in the object
"Sep" is 8.5. The difference between these two numbers is:
Select one:
a. A population.
b. A sample.
c. A statistic.
d. None of the above.
Feedback
The correct answer is: A statistic.
Question 8
Correct
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