In one study, researchers at McGill University recruited127 people with high cholesterol and split them into twogroups. One took a probiotic supplement twice a dayfor nine weeks, while the second group took a placebo.The probiotic group saw their total cholesterol drop by 9 percent and their LDL, or “bad cholesterol,” fall almost12 percent. In a different study, conducted in Britain,80 volunteers “were given probiotics for six weeks andthen switched, later on, to a placebo. That study found nodifference in cholesterol levels when the subjects took thesupplement versus the dummy pills.”Which of the following is true: a) The McGill study is a controlled randomized experi-ment, while the British study is an observational study. b) The McGill study is a completely randomized ex-periment, while the British study is a matched pairs experiment.c) The results from the McGill study are more validbecause it includes blinding while the British studydoes not.d) We have reason to believe that the design of one ofthese experiments was flawed since the results arecontradictory.e) Conclusions from the British study cannot be trustedsince there is no control group.
In one study, researchers at McGill University recruited127 people with high cholesterol and split them into twogroups. One took a probiotic supplement twice a dayfor nine weeks, while the second group took a placebo.The probiotic group saw their total cholesterol drop by 9 percent and their LDL, or “bad cholesterol,” fall almost12 percent. In a different study, conducted in Britain,80 volunteers “were given probiotics for six weeks andthen switched, later on, to a placebo. That study found nodifference in cholesterol levels when the subjects took thesupplement versus the dummy pills.”Which of the following is true: a) The McGill study is a controlled randomized experi-ment, while the British study is an observational study. b) The McGill study is a completely randomized ex-periment, while the British study is a matched pairs experiment.c) The results from the McGill study are more validbecause it includes blinding while the British studydoes not.d) We have reason to believe that the design of one ofthese experiments was flawed since the results arecontradictory.e) Conclusions from the British study cannot be trustedsince there is no control group.
Linear Algebra: A Modern Introduction
4th Edition
ISBN:9781285463247
Author:David Poole
Publisher:David Poole
Chapter2: Systems Of Linear Equations
Section2.4: Applications
Problem 28EQ
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In one study, researchers at McGill University recruited
127 people with high cholesterol and split them into two
groups. One took a probiotic supplement twice a day
for nine weeks, while the second group took a placebo.
The probiotic group saw their total cholesterol drop by
9 percent and their LDL, or “bad cholesterol,” fall almost
12 percent. In a different study, conducted in Britain,
80 volunteers “were given probiotics for six weeks and
then switched, later on, to a placebo. That study found no
difference in cholesterol levels when the subjects took the
supplement versus the dummy pills.”
Which of the following is true:
12 percent. In a different study, conducted in Britain,
80 volunteers “were given probiotics for six weeks and
then switched, later on, to a placebo. That study found no
difference in cholesterol levels when the subjects took the
supplement versus the dummy pills.”
Which of the following is true:
a) The McGill study is a controlled randomized experi-
ment, while the British study is an observational
ment, while the British study is an observational
study.
b) The McGill study is a completely randomized ex-
periment, while the British study is a matched pairs
periment, while the British study is a matched pairs
experiment.
c) The results from the McGill study are more valid
because it includes blinding while the British study
does not.
d) We have reason to believe that the design of one of
these experiments was flawed since the results are
contradictory.
e) Conclusions from the British study cannot be trusted
since there is no control group.
c) The results from the McGill study are more valid
because it includes blinding while the British study
does not.
d) We have reason to believe that the design of one of
these experiments was flawed since the results are
contradictory.
e) Conclusions from the British study cannot be trusted
since there is no control group.
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