Gallup World At its website (www.gallupworldpoll.com) the Gallup World Poll describes their methods.After one report they explained: Results are based on face-to-face interviews with ran-domly selected national samples of approximately 1,000 adults, aged 15 and older, who live permanently in eachof the 21 sub-Saharan African nations surveyed. Thosecountries include Angola (areas where land minesmight be expected were excluded), Benin, Botswana,Burkina Faso, Cameroon, Ethiopia, Ghana, Kenya,Madagascar (areas where interviewers had to walkmore than 20 kilometers from a road were excluded),Mali, Mozambique, Niger, Nigeria, Senegal, SierraLeone, South Africa, Tanzania, Togo, Uganda (the areaof activity of the Lord’s Resistance Army was excludedfrom the survey), Zambia, and Zimbabwe. . . . In allcountries except Angola, Madagascar, and Uganda,the sample is representative of the entire population.a) Gallup is interested in sub-Saharan Africa. What kindof survey design are they using? b) Some of the countries surveyed have large popula-tions. (Nigeria is estimated to have about 130 million people.) Some are quite small. (Togo’s population isestimated at 5.4 million.) Nonetheless, Gallup sampled1000 adults in each country. How does this affect theprecision of its estimates for these countries?7–10. What did they do? For the following reports aboutstatistical studies, identify the following items (ifpossible). If you can’t tell, then say so—this oftenhappens when we read about a survey.a) The populationb) The population parameter of interestc) The sampling framed) The sample e) The sampling method, including whether or not ran-domization was employed f) Any potential sources of bias you can detect and anyproblems you see in generalizing to the population ofinterest

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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Gallup World At its website (www.gallupworldpoll
.com) the Gallup World Poll describes their methods.
After one report they explained:

Results are based on face-to-face interviews with ran-
domly selected national samples of approximately 1,000

adults, aged 15 and older, who live permanently in each
of the 21 sub-Saharan African nations surveyed. Those
countries include Angola (areas where land mines
might be expected were excluded), Benin, Botswana,
Burkina Faso, Cameroon, Ethiopia, Ghana, Kenya,
Madagascar (areas where interviewers had to walk
more than 20 kilometers from a road were excluded),
Mali, Mozambique, Niger, Nigeria, Senegal, Sierra
Leone, South Africa, Tanzania, Togo, Uganda (the area
of activity of the Lord’s Resistance Army was excluded
from the survey), Zambia, and Zimbabwe. . . . In all
countries except Angola, Madagascar, and Uganda,
the sample is representative of the entire population.
a) Gallup is interested in sub-Saharan Africa. What kind
of survey design are they using?

b) Some of the countries surveyed have large popula-
tions. (Nigeria is estimated to have about 130 million

people.) Some are quite small. (Togo’s population is
estimated at 5.4 million.) Nonetheless, Gallup sampled
1000 adults in each country. How does this affect the
precision of its estimates for these countries?
7–10. What did they do? For the following reports about
statistical studies, identify the following items (if
possible). If you can’t tell, then say so—this often
happens when we read about a survey.
a) The population
b) The population parameter of interest
c) The sampling frame
d) The sample

e) The sampling method, including whether or not ran-
domization was employed

f) Any potential sources of bias you can detect and any
problems you see in generalizing to the population of
interest

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