What design? Analyze the design of each researchexample 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? Tests of gene therapy on laboratory rats have raised hopes of stopping the degeneration of tissue that charac-terizes chronic heart failure. Researchers at the Univer-sity of California, San Diego, used hamsters with cardiac disease, randomly assigning 30 to receive the genetherapy and leaving the other 28 untreated. Five weeksafter treatment the gene therapy group’s heart muscles stabilized, while those of the untreated hamsters contin-ued to weaken. (Source: Science News, July 27, 2002) People aged 50 to 71 were initially contacted in the mid-1990s to participate in a study about smoking and blad-der cancer. Data were collected from more than 280,000 men and 186,000 women from eight states who answeredquestions about their health, smoking history, alcoholintake, diet, physical activity, and other lifestyle factors.When the study ended in 2006, about half the bladdercancer cases in adults age 50 and older were traceableto smoking. (Source: Journal of the American MedicalAssociation, August 17, 2011)

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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Question

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?

Tests of gene therapy on laboratory rats have raised

hopes of stopping the degeneration of tissue that charac-
terizes chronic heart failure. Researchers at the Univer-
sity of California, San Diego, used hamsters with cardiac

disease, randomly assigning 30 to receive the gene
therapy and leaving the other 28 untreated. Five weeks
after treatment the gene therapy group’s heart muscles

stabilized, while those of the untreated hamsters contin-
ued to weaken. (Source: Science News, July 27, 2002)

People aged 50 to 71 were initially contacted in the mid-
1990s to participate in a study about smoking and blad-
der cancer. Data were collected from more than 280,000

men and 186,000 women from eight states who answered
questions about their health, smoking history, alcohol
intake, diet, physical activity, and other lifestyle factors.
When the study ended in 2006, about half the bladder
cancer cases in adults age 50 and older were traceable
to smoking. (Source: Journal of the American Medical
Association, August 17, 2011)

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