A city in the midwestern United States is consideringa plan to add roundabout intersections in some hightraffic areas to reduce the number of accidents. Onecity council member used a phone survey to reach hisconstituents containing the following question: “Many people object to the city’s plan to reduce the unneces-sary accidents by turning several intersections into those strange European style roundabouts. Do you also objectto it?” He called the homes in his district during hislunch break at his regular job, which is between 12:00and 12:30 pm. Which of the following is a likely sourceof bias in his survey?a) Calling between 12:00 and 12:30 limits his sampleto people who will be at home during those hours,which leaves out everyone who regularly worksduring that time of day. This might influence theestimate of the proportion of people who object tothe plan.b) The phrase “plan to reduce unnecessary accidents”might influence people to voice support for the plan,making the estimate of the proportion of constituentswho object to the plan too low.c) The phrases “Many people object” and “Do you alsoobject?” may influence people to say they object,inflating the estimate of the proportion of constituentswho object.d) The phrase “strange European style roundabouts”may influence people to say they object, inflatingthe estimate of the proportion of constituents whoobject.e) All of these are possible sources of bias for thissurvey.

Name: A city in the midwestern United States is consideringa plan to add rou
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Description: A city in the midwestern United States is consideringa plan to add roundabout intersections in some hightraffic areas to reduce the number of accidents. Onecity council member used a phone survey to reach hisconstituents containing the following ques

MATLAB: An Introduction with Applications

6th Edition

ISBN:9781119256830

Author:Amos Gilat

Publisher:Amos Gilat

Chapter1: Starting With Matlab

Section: Chapter Questions

Problem 1P

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A city in the midwestern United States is considering
a plan to add roundabout intersections in some high
traffic areas to reduce the number of accidents. One
city council member used a phone survey to reach his
constituents containing the following question: “Many

people object to the city’s plan to reduce the unneces-
sary accidents by turning several intersections into those

strange European style roundabouts. Do you also object
to it?” He called the homes in his district during his
lunch break at his regular job, which is between 12:00
and 12:30 pm. Which of the following is a likely source
of bias in his survey?
a) Calling between 12:00 and 12:30 limits his sample
to people who will be at home during those hours,
which leaves out everyone who regularly works
during that time of day. This might influence the
estimate of the proportion of people who object to
the plan.
b) The phrase “plan to reduce unnecessary accidents”
might influence people to voice support for the plan,
making the estimate of the proportion of constituents
who object to the plan too low.
c) The phrases “Many people object” and “Do you also
object?” may influence people to say they object,
inflating the estimate of the proportion of constituents
who object.d) The phrase “strange European style roundabouts”
may influence people to say they object, inflating
the estimate of the proportion of constituents who
object.
e) All of these are possible sources of bias for this
survey.

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