A. If the results were statistically significant, can the results of this study be generalized to a larger population? Can cause-and-effect be inferred? Explain. B. Explain why it is advantageous to use 350 volunteers in this study, rather than, say, 30 volunteers. C. Name a confounding variable that was controlled in this experiment and explain why it was beneficial to control that variable.
A. If the results were statistically significant, can the results of this study be generalized to a larger population? Can cause-and-effect be inferred? Explain. B. Explain why it is advantageous to use 350 volunteers in this study, rather than, say, 30 volunteers. C. Name a confounding variable that was controlled in this experiment and explain why it was beneficial to control that variable.
Glencoe Algebra 1, Student Edition, 9780079039897, 0079039898, 2018
18th Edition
ISBN:9780079039897
Author:Carter
Publisher:Carter
Chapter4: Equations Of Linear Functions
Section4.5: Correlation And Causation
Problem 11PPS
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Contingency Table
A contingency table can be defined as the visual representation of the relationship between two or more categorical variables that can be evaluated and registered. It is a categorical version of the scatterplot, which is used to investigate the linear relationship between two variables. A contingency table is indeed a type of frequency distribution table that displays two variables at the same time.
Binomial Distribution
Binomial is an algebraic expression of the sum or the difference of two terms. Before knowing about binomial distribution, we must know about the binomial theorem.
Topic Video
Question
7
![Does ginkgo improve memory? The law allow marketers of herbs and other natural substances to
make health claims that are not supported by evidence. Brands of ginkgo extract claim to "improve
memory and concentration." A randomized comparative experiment found no statistically
significant evidence for such effects. The subjects were 350 healthy volunteers over 60 years old.
They were randomly assigned to ginkgo or a placebo pill (a dummy pill that looks and tastes the
same). All the subjects took a battery of tests for learning and memory before treatment started
and again after six weeks.
A. If the results were statistically significant, can the results of this study be generalized to a larger
population? Can cause-and-effect be inferred? Explain.
B. Explain why it is advantageous to use 350 volunteers in this study, rather than, say, 30
volunteers.
C. Name a confounding variable that was controlled in this experiment and explain why it was
beneficial to control that variable.](/v2/_next/image?url=https%3A%2F%2Fcontent.bartleby.com%2Fqna-images%2Fquestion%2Ff66f65ba-cf0f-4034-9756-7d5f7bb0f27e%2F77065492-1d07-4236-af92-08f9d5b23d30%2Fl5sawth_processed.png&w=3840&q=75)
Transcribed Image Text:Does ginkgo improve memory? The law allow marketers of herbs and other natural substances to
make health claims that are not supported by evidence. Brands of ginkgo extract claim to "improve
memory and concentration." A randomized comparative experiment found no statistically
significant evidence for such effects. The subjects were 350 healthy volunteers over 60 years old.
They were randomly assigned to ginkgo or a placebo pill (a dummy pill that looks and tastes the
same). All the subjects took a battery of tests for learning and memory before treatment started
and again after six weeks.
A. If the results were statistically significant, can the results of this study be generalized to a larger
population? Can cause-and-effect be inferred? Explain.
B. Explain why it is advantageous to use 350 volunteers in this study, rather than, say, 30
volunteers.
C. Name a confounding variable that was controlled in this experiment and explain why it was
beneficial to control that variable.
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