MATH 1280 FINAL EXAM LATEST 2026 ACTUAL EXAM 100 QUESTIONS AND CORRECT DETAILED ANSWERS WITH RATIONALES (VERIFIED ANSWERS) |ALREADY GRADED A+

MATH 1280 FINAL EXAM LATEST 2026 ACTUAL EXAM 100 QUESTIONS AND CORRECT DETAILED ANSWERS WITH RATIONALES (VERIFIED ANSWERS) |ALREADY GRADED A+

Information

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:

The population in this survey is:

Question 1

Correct

Mark 1.00 out of 1.00

MATH 1280 FINAL EXAM LATEST 2026 ACTUAL

EXAM 100 QUESTIONS AND CORRECT DETAILED

ANSWERS WITH RATIONALES (VERIFIED

ANSWERS) |ALREADY GRADED A+

Select one:

The team that conducted the survey.

Customers that arrive at dealerships of the company.

"Yes", "No", or "Refuse to Answer".

Customers that arrive at the selected dealerships during the day of visit.

Select one:

The percentage of costumers that possess a car made by the company.

Customers that arrive at the selected dealerships during the day of visit.

"Yes", "No", or "Refuse to Answer".

Owners of cars that are produced by the company.

A parameter that may be targeted by this survey is:

Question 3

Correct

Mark 1.00 out of 1.00

Question 4

Correct

Mark 1.00 out of 1.00

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

The sample in this survey is:

Question 2

Correct

Mark 1.00 out of 1.00

The average number of calls that arrived between 8:00 AM and 8:10 AM during the working days of all months is:

Question 6

Correct

Mark 1.00 out of 1.00

Select one:

A population.

A sample.

A parameter.

A statistic.

The data used to produce the tables and plots is:

Question 5

Correct

Mark 1.00 out of 1.00

Select one:

A population.

A sample.

A parameter.

A statistic.

Information

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: