Answered: The Web site www.twiigs.com allows you…

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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The Web site www.twiigs.com allows you to vote
on polls that interest you or to post one of your own. Once
c08ProducingDataSampling.indd Page 216 9/6/11 4:28:22 PM user-s163 user-F452
you have found a poll of interest, you just click on “Vote,”
and your response becomes part of the sample. One of the
questions in July 2010 was “How many times have you been
pulled over by the police?” Of the 780 people responding,
70% said “1–5 times.” You can conclude that
(a) about 70% of Americans have been pulled over by the
police “1–5 times.”
(b) the poll uses voluntary response, so the results tell us
little about the population of all adults.
(c) more people still need to vote on the question, as a larger
sample is required to reduce bias.

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