Researchers conducted an observational study of automobile drivers and their cell phone use by manually observing traffic in heavily congested areas. They would record the amount of time they observed individual drivers on the phone while operating their vehicle in stop and go traffic and the number of accidents on a particular section of highway over the course of a month. The accompanying graph depict the data they recorded, each point represents a 1 mile section of heavily congested roads. From the data, which of these is a potentially valid conclusion? Cell-phone use while driving increases the rate of accidents. Car accidents and cell-phone use have no relationship. The increasing rate of car accidents causes increased Number of car accidents 10- 9- 8- 7- 6- 85- 3- 2- 0 ● 9 6 7 8 Average length of phone calls (minutes) 10

Researchers conducted an observational study of automobile drivers and their cell phone use by manually observing traffic in heavily congested areas. They would record the amount of time they observed individual drivers on the phone while operating their vehicle in stop and go traffic and the number of accidents on a particular section of highway over the course of a month. The accompanying graph depict the data they recorded, each point represents a 1 mile section of heavily congested roads. From the data, which of these is a potentially valid conclusion? Cell-phone use while driving increases the rate of accidents. Car accidents and cell-phone use have no relationship. The increasing rate of car accidents causes increased Number of car accidents 10- 9- 8- 7- 6- 85- 3- 2- 0 ● 9 6 7 8 Average length of phone calls (minutes) 10

ENGR.ECONOMIC ANALYSIS

14th Edition

ISBN:9780190931919

Author:NEWNAN

Publisher:NEWNAN

Chapter1: Making Economics Decisions

Section: Chapter Questions

Problem 1QTC

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Question

Researchers conducted an observational study of automobile
drivers and their cell phone use by manually observing
traffic in heavily congested areas. They would record the
amount of time they observed individual drivers on the
phone while operating their vehicle in stop and go traffic and
the number of accidents on a particular section of highway
over the course of a month.
The accompanying graph depict the data they recorded, each
point represents a 1 mile section of heavily congested roads.
From the data, which of these is a potentially
valid conclusion?
Cell-phone use while driving increases the rate
of accidents.
O Car accidents and cell-phone use have no relationship.
The increasing rate of car accidents causes increased
phone-call length.
A conclusion cannot be made; the data ignores the
omitted variable of which cell-phone provider each
person uses.
If the x and y variables were swapped, what would the new
slope be?
zero
positive
Number of car accidents
10-
9-
8-
7-
5-
4-
3-
2-
1-
0
•
2
6
7 8
Average length of phone calls (minutes)
9
●
10

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