- Is a control group always necessary?
- When would you use a control group?
- Why is having a control group important?
- Why are double blind procedures important in drug trials?
- How does blinding reduce bias?
- Why would it be difficult to use a double blind procedure?
- What happens in a double blind trial?
- Why do double blind trials improve reliability?
- Why is it bad to not have a control group?
Is a control group always necessary?
In an experiment, you need to include a control group that is identical to the treatment group in every way except that it does not receive the experimental treatment.
By including a control group, you can eliminate the possible impact of all other variables.
When would you use a control group?
A typical use of a control group is in an experiment in which the effect of a treatment is unknown and comparisons between the control group and the experimental group are used to measure the effect of the treatment.
Why is having a control group important?
You would compare the results from the experimental group with the results of the control group to see what happens when you change the variable you want to examine. A control group is an essential part of an experiment because it allows you to eliminate and isolate these variables.
Why are double blind procedures important in drug trials?
The double blind method is an important part of the scientific method, used to prevent research outcomes from being ‘influenced’ by the placebo effect or observer bias. Blinded research is an important tool in many fields of research, from medicine, to psychology and the social sciences, to forensics.
How does blinding reduce bias?
Blinding aims to reduce the risk of bias that can be caused by an awareness of group assignment. With blinding, out- comes can be attributed to the intervention itself and not influenced by behaviour or assessment of outcomes that can result purely from knowledge of group allocation.
Why would it be difficult to use a double blind procedure?
Common difficulties with the double-blind study Lack of adequate demographic controls When studies are BP (between patient), the patients are randomized such that essential demographics, such as age, sex, relevant facets of health such as blood pressure or weight, and sometimes racial/ethnic group are controlled for.
What happens in a double blind trial?
A double blind trial is a trial where neither the researchers nor the patients know what they are getting. The computer gives each patient a code number. And the code numbers are then allocated to the treatment groups. Your treatment arrives with your code number on it.
Why do double blind trials improve reliability?
A double-blind study is one in which neither the participants nor the experimenters know who is receiving a particular treatment. This procedure is utilized to prevent bias in research results. Double-blind studies are particularly useful for preventing bias due to demand characteristics or the placebo effect.
Why is it bad to not have a control group?
Failure to use a control group, or use of an inappropriate control group, can make it impossible to draw meaningful conclusions from a study. Failure to Demonstrate the Comparability of Patients in Treatment and Control Groups.