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Sagot :
Please note that the experiment was not an Observational Study.
Why was the experiment not an Observational Study?
a) It cannot be described as an Observational study because the elements of control were present. The control group was the group who were given placebos.
The other answers are:
b) The explanatory variable is Vitamin C that was administered.
c) Yes, the patients were blinded to their treatment because they had no information about which grammage of vitamin c they were given or whether it was even a placebo. All the pills were identical.
d) Yes. Double-blind in research is a type of clinical trial where neither the participants nor the researcher as the details of the intervention being given until the trial is over. This helps to reduce bias.
e) Yes it does introduce confounding variables in the study. A confounding variable is that which affects other variables in such a manner that creates a distortion of association between the dependent and independent variables. This was almost unavoidable because the pill had to be taken at the onset of a cold.
What is an Observational Study?
The key factor about Observational Studies is that they occur without interference by the researcher. The second is that the participants are observed in their natural state or behavior.
See the link below for more about Observational Study:
https://brainly.com/question/622147
See the link below for more about explanatory variables:
https://brainly.com/question/16601895
See the link below for more about confounding variable
https://brainly.com/question/10458420
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