### 7.25 Fuel EconomyAlthough the Environmental Protection Agency (EPA) establishes the tests to determine the fuel economy of new cars, it often does not perform them. Instead, the test protocols are given to the car companies, and the companies perform the tests themselves. To keep the industry honest, the EPA runs some spot checks each year. Recently, the EPA announced that Hyundai and Kia must lower their fuel economy estimates for many of their models.**Data Investigation:**The table below presents city miles per gallon (mpg) values for one of the models the EPA investigated:| Values ||--------|| 28.0 || 25.7 || 25.8 || 28.0 || 28.5 || 29.8 || 30.2 || 30.4 || 26.9 || 28.3 || 29.8 || 27.2 || 26.7 || 27.7 || 29.5 || 28.0 |**Statistical Analysis:**Calculate a 95% confidence interval for $ \mu $, the mean city mpg for this model. **Note:** Confidence intervals are used to estimate the range in which a population parameter will lie with a certain level of certainty, based on sample data.

Given: n = 16 Confidence level = 95% Formula Used: Confidence Interval = X ± t*sn

Answered: 7.25 Fuel economy. Although the…

MATLAB: An Introduction with Applications

6th Edition

ISBN:9781119256830

Author:Amos Gilat

Publisher:Amos Gilat

Chapter1: Starting With Matlab

Section: Chapter Questions

Problem 1P

See similar textbooks

Similar questions

1. Identify whether the variable in the information below is qualitative or quantitative. A nurse collects blood from kids and measure their blood-sugar content. This measure of blood-sugar concentration is a variable. a. quantitative b. qualitative c. qualitative as well as quantitative d. neither qualitative nor quantitative 2. Identify the technique for gathering data in the study below. A pharmaceutical firm wants test the effectiveness of a new drug. It wants to know if the new drug is significantly stronger than the conventional drug. This is a/an study. a. observational b. experimental c. census d. sampling 3. You want to plot a frequency graph of daily rainfall, with rainfalls (inches) on the horizontal axis. You will use a a. bar chart b. histogram c. cumulative frequency d. best fit line 4. Frequency of categorical data are displayed using a a. bar chart b. histogram c. time series graph d. best fit line
The National Hurricane Center provides data that list the number of large (category 3, 4, or 5) hurricanes that have struck the United States, by decade, from 1851-2020. Is there sufficient evidence that the number of large hurricanes have remained constant (per decade)? What are the degrees of freedom? Decade Count Decade Count 1851-1860 6 1941-1950 10 1861-1870 1 1951-1960 8 1871-1880 7 1961-1970 6 1881-1890 5 1971-1980 4 1891-1900 8 1981-1990 5 1901-1910 4 1991-2000 5 1911-1920 7 2001-2010 8 1921-1930 5 2011-2020 10 1931-1940 8 Chi-squared test for given probabilitiesdata: stormsX-squared = 13.589, df = 16, p-value = 0.6293 A. 107 B. 17 C. 13.589 D. 16
How would you answer this?
If you have a qualitative independent variable that can take on 4 possible values, how many indicator variables do you need to create? O 3 O 4 O 5 O 6
What unit of analysis is reflected: "There is a relationship between unemployment rates and crime rates in a city such that cities with lower unemployment rates experience less crime."
In 2010, the U.S. Congress passed the historic health care reform bill that will provide some type of coverage for the 32 million Americans currently without health care insurance. Just how widespread is the lack of medical coverage? The media claim that the segments of the population most at risk for disease and thus needing healthcare are women, children, the elderly and the poor. The following tables were generated from the U.S. Census Bureau, Current Population Survey, Annual Social and Economic Supplement (2011). The tables report the number of uninsured (in thousands) by sex, by age, and by household income. Is being insured or not dependent on gender? Fill in the degrees of freedom and p-value in the output below and draw a clear conclusion indicating which gender is more at risk of not being insured if there is a significant difference.
Johnson Wholesale Company manufactures a variety of products. The prices and quantities produced for April 2010 and April 2019 are: 2010 2019 2010 Quantity 2019 Quantity Product Price Price Produced Produced Small motor (each) $ 23.92 $ 28.29 1,413 4,234 Scrubbing compound (gallon) 2.32 3.70 86,827 62,984 Nails (pound) 0.19 0.86 9,332 22,336 Click here for the Excel Data FileUsing April 2010 as the base period, find the value index of goods produced for April 2019. (Round your answer to 2 decimal places.)
Two scales at Aussieburgers, Ltd. were used to weigh the same 24 samples of hamburger patties for a fast-food restaurant in Australia. Results are shown below. The samples were weighed in grams, and the supplier has ensured that each patty weighs 114 grams. Which of the following is correct? Scale A: 117, 113, 115, 111, 115 111, 117, 115, 118, 118 114, 113, 116, 112, 118 113, 113, 117, 114, 118 117, 118, 111, 115, 114 Scale B: 117, 111, 114, 117, 111 116, 112, 116, 117, 118 112, 115, 112, 118, 115 114, 117, 116, 111, 114 116, 116, 112, 114, 117 Question 1 options: A. Scale A is more accurate and A is more precise. B. Scale A is more accurate and B is more precise. C. Scale B is more accurate and B is more precise. D. Scale B is more accurate and A is more precise.
Beanie babies are toy stuffed animals that have become valuable collector’s items. Beanie World Magazine provided the age, retired status (R for Retired and C for Current), and value of 50 Beanie babies. The data Beanie can be downloaded from Blackboard. Answer the following questions using Minitab. a) Show the retired/current status of the 50 Beanie babies with pie chart and bar chart. b) What percentage of the age measurements actually fall into ¯x±s, ¯x±2s, and ¯x±3s. Compare your result with the empirical rule
Price of eggs and milk: The following table presents the average price in dollars for a dozen eggs and a gallon of milk for each month from February through November 2002. Use a TI-84 calculator to answer the following. Dozen Eggs Gallon of Milk 1.28 3.18 1.13 3.23 1.16 3.23 1.19 3.21 1.14 3.12 1.17 3.09 1.17 3.14 1.28 3.13 1.26 3.17 1.28 3.21

Recommended textbooks for you

MATLAB: An Introduction with Applications

Statistics

ISBN:

9781119256830

Author:

Amos Gilat

Publisher:

John Wiley & Sons Inc

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

ISBN:

9781305504912

Author:

Frederick J Gravetter, Larry B. Wallnau

Publisher:

Cengage Learning

MATLAB: An Introduction with Applications

Statistics

ISBN:

9781119256830

Author:

Amos Gilat

Publisher:

John Wiley & Sons Inc

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

ISBN:

9781305504912

Author:

Frederick J Gravetter, Larry B. Wallnau

Publisher:

Cengage Learning

Elementary Statistics: Picturing the World (7th E…

Statistics

ISBN:

9780134683416

Author:

Ron Larson, Betsy Farber

Publisher:

PEARSON

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

Statistics

ISBN:

9781319013387

Author:

David S. Moore, George P. McCabe, Bruce A. Craig

Publisher:

W. H. Freeman

SEE MORE TEXTBOOKS