A number of minor automobile accidents occur at various high-risk intersections in Teton County despite traffic lights. The Traffic Department claims that a modification in the type of light will reduce these accidents. The county commissioners have agreed to a proposed experiment. Eight intersections were chosen at random, and the lights at those intersections were modified. The numbers of minor accidents during a six-month period before and after the modifications were: Intersection # Accidents Before Modification # Accidents After Modification 4 7 3 6 5 5 3 7 7 At the .01 sigmificance level, is it reasonable to conclude that the modification reduced the number of traffic accidents? ABCDEFGH

A number of minor automobile accidents occur at various high-risk intersections in Teton County despite traffic lights. The Traffic Department claims that a modification in the type of light will reduce these accidents. The county commissioners have agreed to a proposed experiment. Eight intersections were chosen at random, and the lights at those intersections were modified. The numbers of minor accidents during a six-month period before and after the modifications were: Intersection # Accidents Before Modification # Accidents After Modification 4 7 3 6 5 5 3 7 7 At the .01 sigmificance level, is it reasonable to conclude that the modification reduced the number of traffic accidents? ABCDEFGH

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Description: A number of minor automobile accidents occur at various high-risk intersections in TetonCounty despite traffic lights. The Traffic Department claims that a modification in the type of light willreduce these accidents. The county commissioners have a

MATLAB: An Introduction with Applications

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ISBN:9781119256830

Author:Amos Gilat

Publisher:Amos Gilat

Chapter1: Starting With Matlab

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Concept explainers

Types of Bias

Statistics is the study of data collection, organization, analysis, interpretation, and presentation. Statistical bias is a characteristic of a statistical technique or its findings in which the expected value deviates from the actual root quantitative parameter being estimated. According to the actual definition of bias, it refers to the tendency of a statistic to overestimate or underestimate a parameter.

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Question

A number of minor automobile accidents occur at various high-risk intersections in Teton
County despite traffic lights. The Traffic Department claims that a modification in the type of light will
reduce these accidents. The county commissioners have agreed to a proposed experiment. Eight intersections
were chosen at random, and the lights at those intersections were modified. The numbers of minor accidents
during a six-month period before and after the modifications were:
Intersection
# Accidents Before Modification
# Accidents After Modification
A
4
в
7
3
D
5
E
6
3
F
8
7
G
7
5
H.
At the .01 significance level, is it reasonable to conclude that the modification reduced the number of traffic
accidents?

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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…
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