Modern Business Statistics with Microsoft Office Excel (with XLSTAT Education Edition Printed Access Card) (MindTap Course List)
6th Edition
ISBN: 9781337115186
Author: David R. Anderson, Dennis J. Sweeney, Thomas A. Williams, Jeffrey D. Camm, James J. Cochran
Publisher: Cengage Learning
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Chapter 14.7, Problem 44E
Auto Racing Helmet. Automobile racing, high-performance driving schools, and driver education programs run by automobile clubs continue to grow in popularity. All these activities require the participant to wear a helmet that is certified by the Snell Memorial Foundation, a not-for-profit organization dedicated to research, education, testing, and development of helmet safety standards. Snell “SA” (Sports Application)-rated professional helmets are designed for auto racing and provide extreme impact resistance and high fire protection. One of the key factors in selecting a helmet is weight, since lower weight helmets tend to place less stress on the neck. Consider the following data showing the weight and price for 18 SA helmets.
- a. Develop a
scatter diagram with weight as the independent variable. - b. Does there appear to be any relationship between these two variables?
- c. Develop the estimated regression equation that could be used to predict the price given the weight.
- d. Test for the significance of the relationship at the .05 level of significance.
- e. Did the estimated regression equation provide a good fit? Explain.
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Background: To prevent crashes caused by running red lights, many states are installing cameras at
dangerous intersections. These cameras are used to take photographs of the license plates of vehicles that
run a red light. The Virginia Department of Transportation (VDOT) obtained data on the number of crashes
per year caused by running a red light at 13 intersections in Fairfax County, Virginia.
Source: Virginia Transportation Research Council, "Research Report: The Impact of Red Light Cameras
(Photo-Red Enforcement) on Crashes in Virginia", June 2007
Directions: Perform an appropriate significance test to determine whether or not the reduction in the
number of crashes was statistically significant.
1. Click on the Data button below to display the data. Copy the data into a statistical software package
and click the Data button a second time to hide it.
Data
Before After
3.7 1.26
0.1
0
4.55 1.69
2.4
1.94
2.09 3.24
2.5
2.72
0.83
0.24
3.05
1.67
3.21
0.33
1.08
0.18
1.25 0.99
7.25 5.02
191…
Background: To prevent crashes caused by running red lights, many states are installing cameras at
dangerous intersections. These cameras are used to take photographs of the license plates of vehicles that
run a red light. The Virginia Department of Transportation (VDOT) obtained data on the number of crashes
per year caused by running a red light at 13 intersections in Fairfax County, Virginia.
Source: Virginia Transportation Research Council, "Research Report: The Impact of Red Light Cameras
(Photo-Red Enforcement) on Crashes in Virginia", June 2007
Directions: Perform an appropriate significance test to determine whether or not the reduction in the
number of crashes was statistically significant.
RED
LIGHT
PHOTO
ENFORCED
1. Click on the Data button below to display the data. Copy the data into a statistical software package
and click the Data button a second time to hide it.
Data
Before After
3.5
1.46
0.47
0.1
0.39
0
4.55 1.69
2.6 2.04
2.39
3.14
2.5
2.62
0.83
0.14
3.25
1.57
3.41…
Background: To prevent crashes caused by running red lights, many states are installing cameras at
dangerous intersections. These cameras are used to take photographs of the license plates of vehicles that
run a red light. The Virginia Department of Transportation (VDOT) obtained data on the number of crashes
per year caused by running a red light at 13 intersections in Fairfax County, Virginia.
RED
LIGHT
PHOTO
ENFORCED
Source: Virginia Transportation Research Council, "Research Report: The Impact of Red Light Cameras
(Photo-Red Enforcement) on Crashes in Virginia", June 2007
Directions: Perform an appropriate significance test to determine whether or not the reduction in the
number of crashes was statistically significant.
1. Click on the Data button below to display the data. Copy the data into a statistical software package
and click the Data button a second time to hide it.
Data
Before
After
3.7
1.26
0.37
0.1
0.39
0
4.55
1.69
2.4
1.94
2.09
3.24
2.5
2.72
0.83
0.24
3.05
1.67
3.21…
Chapter 14 Solutions
Modern Business Statistics with Microsoft Office Excel (with XLSTAT Education Edition Printed Access Card) (MindTap Course List)
Ch. 14.2 - Given are five observations for two variables, x...Ch. 14.2 - Given are five observations for two variables, x...Ch. 14.2 - Given are five observations collected in a...Ch. 14.2 - Retail and Trade: Female Managers. The following...Ch. 14.2 - Production Line Speed and Quality Control. Brawdy...Ch. 14.2 - The National Football League (NFL) records a...Ch. 14.2 - Sales Experience and Performance. A sales manager...Ch. 14.2 - Broker Satisfaction. The American Association of...Ch. 14.2 - Companies in the U.S. car rental market vary...Ch. 14.2 - Age and the Price of Wine. For a particular red...
Ch. 14.2 - Laptop Ratings. To help consumers in purchasing a...Ch. 14.2 - Stock Beta. In June of 2016, Yahoo Finance...Ch. 14.2 - Distance and Absenteeism. A large city hospital...Ch. 14.2 - Using a global-positioning-system (GPS)-based...Ch. 14.3 - 15. The data from exercise 1...Ch. 14.3 - The data from exercise 2 follow.
The estimated...Ch. 14.3 - Prob. 17ECh. 14.3 - Price and Quality of Headphones. The following...Ch. 14.3 - Sales Experience and Sales Performance. In...Ch. 14.3 - Price and Weight of Bicycles. Bicycling, the...Ch. 14.3 - Cost Estimation. An important application of...Ch. 14.3 - 22. Refer to exercise 9, where the following data...Ch. 14.5 - The data from exercise 1 follow.
Compute the mean...Ch. 14.5 - The data from exercise 2 follow.
Compute the mean...Ch. 14.5 - The data from exercise 3 follow.
What is the...Ch. 14.5 - Prob. 26ECh. 14.5 - To identify high-paying jobs for people who do not...Ch. 14.5 - Broker Satisfaction Conclusion. In exercise 8,...Ch. 14.5 - Cost Estimation Conclusion. Refer to exercise 21,...Ch. 14.5 - Significance of Fleet Size on Rental Car Revenue....Ch. 14.5 - Significance of Racing Bike Weight on Price. In...Ch. 14.6 - 32. The data from exercise 1...Ch. 14.6 - 33. The data from exercise 2...Ch. 14.6 - Prob. 34ECh. 14.6 - 35. The following data are the monthly salaries y...Ch. 14.6 - 36. In exercise 7, the data on y = annual sales ($...Ch. 14.6 - In exercise 5, the following data on x = the...Ch. 14.6 - Prob. 38ECh. 14.6 - 39. In exercise 12, the following data on x =...Ch. 14.7 - The commercial division of a real estate firm...Ch. 14.7 - Following is a portion of the regression output...Ch. 14.7 - Prob. 43ECh. 14.7 - Auto Racing Helmet. Automobile racing,...Ch. 14.8 - Prob. 45ECh. 14.8 - Prob. 46ECh. 14.8 - Prob. 47ECh. 14.8 - Prob. 48ECh. 14.8 - Prob. 49ECh. 14.9 - Consider the following data for two variables, x...Ch. 14.9 - Prob. 51ECh. 14.9 - Predicting Charity Expenses. Charity Navigator is...Ch. 14.9 - Many countries, especially those in Europe, have...Ch. 14.9 - Valuation of a Major League Baseball Team. The...Ch. 14 - The Dow Jones Industrial Average (DJIA) and the...Ch. 14 - Home Sire and Price. Is the number of square feet...Ch. 14 - Online Education. One of the biggest changes in...Ch. 14 - Machine Maintenance. Jensen Tire & Auto is in the...Ch. 14 - Bus Maintenance. The regional transit authority...Ch. 14 - Studying and Grades. A marketing professor at...Ch. 14 - Used Car Mileage and Price. The Toyota Camry is...Ch. 14 - One measure of the risk or volatility of an...Ch. 14 - As part of a study on transportation safety, the...Ch. 14 - Consumer Reports tested 166 different...Ch. 14 - When trying to decide what car to buy, real value...Ch. 14 - Buckeye Creek Amusement Park is open from the...
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