for question 3: how would having people not wear insoles at all cause a placebo effect, at least compared to having them wear the normal insoles?

The fact that the Treatment group has received something that the Control group hasn't might psychologically impact the Treatment group. The Treatment group might become more confident having received extra equipment. Compared to the Control group that didn't get to experience that little burst of excitement we all get from being introduced to something new.

>Problem 2: What is the primary purpose of randomly assigning the runners to use either the new or existing insoles? Roughly similar groups also reduce the confounding effect, right? Why should the answer not be B

Having 2 roughly similar groups doesn't guarantee that you might not have to deal with any confounding variables.

In problem 3, why does the placebo effect lead to confounding?

Confounding is when some other variable impacts the experiment. Basically, the placebo can introduce psychological factors that impact the results of the experiment. While you may not think this is a big deal, a lot of diseases/medical issues can be caused by psychological factors e.g., hives, insomnia.

Why should question 2 be A and not B?

There is no reason that the experiment might limit replication. However, since the runners do not know which insoles they were given, it might create a placebo effect, where the runner thinks it will make running easier.

Main content

Statistics and probability

Course: Statistics and probability > Unit 6

Lesson 5: Experiments

Principles of experiment design

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Elle
Posted 3 years ago. Direct link to Elle's post “for question 3: how would...”
for question 3: how would having people not wear insoles at all cause a placebo effect, at least compared to having them wear the normal insoles?
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(16 votes)
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- MrBentley.x
  Posted 2 years ago. Direct link to MrBentley.x's post “The fact that the Treatme...”
  The fact that the Treatment group has received something that the Control group hasn't might psychologically impact the Treatment group. The Treatment group might become more confident having received extra equipment. Compared to the Control group that didn't get to experience that little burst of excitement we all get from being introduced to something new.
  Comment on MrBentley.x's post “The fact that the Treatme...”
  (7 votes)
sgopalan58
Posted 4 years ago. Direct link to sgopalan58's post “>Problem 2: What is the p...”
>Problem 2: What is the primary purpose of randomly assigning the runners to use either the new or existing insoles?

Roughly similar groups also reduce the confounding effect, right? Why should the answer not be B
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(4 votes)
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- nik
  Posted 2 years ago. Direct link to nik's post “Having 2 roughly similar ...”
  Having 2 roughly similar groups doesn't guarantee that you might not have to deal with any confounding variables.
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  (4 votes)
kishan.thacker98
Posted 8 months ago. Direct link to kishan.thacker98's post “In question 3 option 3 is...”
In question 3 option 3 is also reasonably correct as we can say that by not providing insole to one group the study will become sort of observational as we can correlate whether having insole is reducing the shin splints. I agree that option 1 is most appropriate but again why option 3 shall be incorrect that I would like to know..
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(3 votes)
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- cossine
  Posted 2 months ago. Direct link to cossine's post “From Wikipedia: an obser...”
  From Wikipedia:
  
  an observational study draws inferences from a sample to a population where the independent variable is not under the control of the researcher because of ethical concerns or logistical constraints.
  
  In this scenario we can control the independent random variable whether a person receives the new insole.
  
  The article does great job in explaining when an observational study is required.
  
  https://en.wikipedia.org/wiki/Observational_study
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  (1 vote)
ss1003706
Posted 2 months ago. Direct link to ss1003706's post “In problem 3, why does th...”
In problem 3, why does the placebo effect lead to confounding?
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(2 votes)
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- cossine
  Posted 2 months ago. Direct link to cossine's post “Confounding is when some ...”
  Confounding is when some other variable impacts the experiment. Basically, the placebo can introduce psychological factors that impact the results of the experiment.
  
  While you may not think this is a big deal, a lot of diseases/medical issues can be caused by psychological factors e.g., hives, insomnia.
  Button navigates to signup page
  (2 votes)
Maecie Rogahn
Posted a year ago. Direct link to Maecie Rogahn's post “My question got answered”
My question got answered
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Asiwome Agbleze
Posted 5 years ago. Direct link to Asiwome Agbleze's post “Why should question 2 be ...”
Why should question 2 be A and not B?
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- Chennu Wang
  Posted 4 years ago. Direct link to Chennu Wang's post “There is no reason that t...”
  There is no reason that the experiment might limit replication. However, since the runners do not know which insoles they were given, it might create a placebo effect, where the runner thinks it will make running easier.
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  (2 votes)
chinmayi.karthik16
Posted 2 months ago. Direct link to chinmayi.karthik16's post “What is the placebo effec...”
What is the placebo effect?
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(1 vote)
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2405007
Posted 9 months ago. Direct link to 2405007's post “what is confounding?”
what is confounding?
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