We are interested in exploring the relationship between the weight of a vehicle and its fuel efficiency (gasoline mileage). The data in the table show the weights, in pounds, and fuel efficiency, measured in miles per gallon, for a sample of 12 vehicles. Fuel Weight Efficiency 2685 24 2560 27 2660 29 2790 38 3000 25 3410 22 3640 20 3700 25 3880 21 3900 21 4060 19 4710 15

MATLAB: An Introduction with Applications
6th Edition
ISBN:9781119256830
Author:Amos Gilat
Publisher:Amos Gilat
Chapter1: Starting With Matlab
Section: Chapter Questions
Problem 1P
icon
Related questions
Topic Video
Question

Please label each part

 

SUBPART

**Exploring Weight and Fuel Efficiency in Vehicles**

We are interested in exploring the relationship between the weight of a vehicle and its fuel efficiency (gasoline mileage). The data in the table show the weights, in pounds, and fuel efficiency, measured in miles per gallon, for a sample of 12 vehicles.

| Weight (lbs) | Fuel Efficiency (mpg) |
|--------------|-----------------------|
| 2685         | 24                    |
| 2560         | 27                    |
| 2660         | 29                    |
| 2790         | 38                    |
| 3000         | 25                    |
| 3410         | 22                    |
| 3640         | 20                    |
| 3700         | 25                    |
| 3880         | 21                    |
| 3900         | 21                    |
| 4060         | 19                    |
| 4710         | 15                    |

In this study, we aim to determine how the weight of a vehicle affects its fuel efficiency. Typically, lighter vehicles tend to have better fuel efficiency, but this data set will help us analyze specific trends and outliers in a small sample of vehicles.
Transcribed Image Text:**Exploring Weight and Fuel Efficiency in Vehicles** We are interested in exploring the relationship between the weight of a vehicle and its fuel efficiency (gasoline mileage). The data in the table show the weights, in pounds, and fuel efficiency, measured in miles per gallon, for a sample of 12 vehicles. | Weight (lbs) | Fuel Efficiency (mpg) | |--------------|-----------------------| | 2685 | 24 | | 2560 | 27 | | 2660 | 29 | | 2790 | 38 | | 3000 | 25 | | 3410 | 22 | | 3640 | 20 | | 3700 | 25 | | 3880 | 21 | | 3900 | 21 | | 4060 | 19 | | 4710 | 15 | In this study, we aim to determine how the weight of a vehicle affects its fuel efficiency. Typically, lighter vehicles tend to have better fuel efficiency, but this data set will help us analyze specific trends and outliers in a small sample of vehicles.
**Part (h)**

**Identify any outliers, using either the graphical or numerical procedure demonstrated in the textbook. (Select all that apply.)**

- [ ] no outliers
- [ ] (4710, 15)
- [ ] (2685, 24)
- [ ] (3700, 25)
- [ ] (2790, 38)
- [ ] (4060, 19)

---

**Part (i)**

The outlier is a hybrid car that runs on gasoline and electric technology, but all other vehicles in the sample have engines that use gasoline only. Explain why it would be appropriate to remove the outlier from the data in this situation.

- ( ) The outlier is creating a curved least squares regression line.
- ( ) The outlier does not lie directly on the line, but it is close.
- ( ) The outlier represents a different population of vehicles compared to the rest.
- ( ) The outlier lies directly on the line, so the error residual (\( y - \hat{y} \)) is zero.

Remove the outlier from the sample data. Find the new correlation coefficient and coefficient of determination. (Round your answers to two decimal places.)

- **correlation coefficient**: [______]
- **coefficient of determination**: [______]

Find the new best fit line. (Round your answers to four decimal places.)

- \( \hat{y} = \) [______]x + [______]

---

**Part (j)**

Compare the correlation coefficients and coefficients of determination before and after removing the outlier, and explain what these numbers indicate about how the model has changed.

- ( ) The new linear model is a better fit, because the new correlation coefficient is closer to zero.
- ( ) The first linear model is a better fit, because the first correlation coefficient is closer to zero.
- ( ) The new linear model is a better fit, because the new correlation coefficient is farther from zero.
- ( ) The first linear model is a better fit, because the first correlation coefficient is farther from zero.
Transcribed Image Text:**Part (h)** **Identify any outliers, using either the graphical or numerical procedure demonstrated in the textbook. (Select all that apply.)** - [ ] no outliers - [ ] (4710, 15) - [ ] (2685, 24) - [ ] (3700, 25) - [ ] (2790, 38) - [ ] (4060, 19) --- **Part (i)** The outlier is a hybrid car that runs on gasoline and electric technology, but all other vehicles in the sample have engines that use gasoline only. Explain why it would be appropriate to remove the outlier from the data in this situation. - ( ) The outlier is creating a curved least squares regression line. - ( ) The outlier does not lie directly on the line, but it is close. - ( ) The outlier represents a different population of vehicles compared to the rest. - ( ) The outlier lies directly on the line, so the error residual (\( y - \hat{y} \)) is zero. Remove the outlier from the sample data. Find the new correlation coefficient and coefficient of determination. (Round your answers to two decimal places.) - **correlation coefficient**: [______] - **coefficient of determination**: [______] Find the new best fit line. (Round your answers to four decimal places.) - \( \hat{y} = \) [______]x + [______] --- **Part (j)** Compare the correlation coefficients and coefficients of determination before and after removing the outlier, and explain what these numbers indicate about how the model has changed. - ( ) The new linear model is a better fit, because the new correlation coefficient is closer to zero. - ( ) The first linear model is a better fit, because the first correlation coefficient is closer to zero. - ( ) The new linear model is a better fit, because the new correlation coefficient is farther from zero. - ( ) The first linear model is a better fit, because the first correlation coefficient is farther from zero.
Expert Solution
trending now

Trending now

This is a popular solution!

steps

Step by step

Solved in 3 steps with 3 images

Blurred answer
Knowledge Booster
Algebraic Operations
Learn more about
Need a deep-dive on the concept behind this application? Look no further. Learn more about this topic, statistics and related others by exploring similar questions and additional content below.
Recommended textbooks for you
MATLAB: An Introduction with Applications
MATLAB: An Introduction with Applications
Statistics
ISBN:
9781119256830
Author:
Amos Gilat
Publisher:
John Wiley & Sons Inc
Probability and Statistics for Engineering and th…
Probability and Statistics for Engineering and th…
Statistics
ISBN:
9781305251809
Author:
Jay L. Devore
Publisher:
Cengage Learning
Statistics for The Behavioral Sciences (MindTap C…
Statistics for The Behavioral Sciences (MindTap C…
Statistics
ISBN:
9781305504912
Author:
Frederick J Gravetter, Larry B. Wallnau
Publisher:
Cengage Learning
Elementary Statistics: Picturing the World (7th E…
Elementary Statistics: Picturing the World (7th E…
Statistics
ISBN:
9780134683416
Author:
Ron Larson, Betsy Farber
Publisher:
PEARSON
The Basic Practice of Statistics
The Basic Practice of Statistics
Statistics
ISBN:
9781319042578
Author:
David S. Moore, William I. Notz, Michael A. Fligner
Publisher:
W. H. Freeman
Introduction to the Practice of Statistics
Introduction to the Practice of Statistics
Statistics
ISBN:
9781319013387
Author:
David S. Moore, George P. McCabe, Bruce A. Craig
Publisher:
W. H. Freeman