Answered: What design? Analyze the design of each…

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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What design? Analyze the design of each research
example reported. Is it a sample survey, an observational

study, or an experiment? If a sample, what are the popula-
tion, the parameter of interest, and the sampling procedure?

If an observational study, was it retrospective or prospective?

If an experiment, describe the factors, treatments, randomi-
zation, response variable, and any blocking, matching, or

blinding that may be present. In each, what kind of conclu-
sions can be reached?

Data were collected over a decade from 1021 men and

women with a recent history of precancerous colon pol-
yps. Participants were randomly assigned to receive folic

acid (a B vitamin) or a placebo, and the study concluded
that those receiving the folic acid may actually increase
their risk of developing additional precancerous growths.
Previous studies suggested that taking folic acid may help
to prevent colorectal cancer. (Source: JAMA 2007, 297)

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