Single Blind Study Example

If both groups are aware the experiment is not blinded. Single blind studies are typically conducted when the participants knowledge of their group membership or the identity of the materials they are assessing might bias the results. Good blinding can reduce or eliminate experimental biases that arise from a participants expectations observer s effect on the participants observer bias confirmation bias and other sources.

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In a blind or blinded experiment information which may influence the participants of the experiment is withheld masked or blinded until after the experiment is complete.

Single blind study example. If participants knew that the researchers were testing a hypothesis that the drug increased alertness they might start acting more alert after ingesting the medication. A double blind experiment requires that both researchers and test subjects are unaware of who is receiving the treatment and who is receiving the placebo. You have developed a new flu vaccine.

However there are situations where creating such ignorance might be impossible or unethical and in others it might be advisable for more than the participants to be kept unaware of the test conditions. In order to test the effectiveness of your new treatment you run an experiment giving half of your participants the flu vaccine and the other half a fake vaccine that will have no effect. In a single blind experiment the study participants do not know whether they are in the treatment or the control group but the investigators do.

In a single blind study the participants in the clinical trial do not know if they are receiving the placebo or the real treatment. If only one group is unaware it is a single blind experiment. This is done to reduce the risk of errors since some participants might produce spurious results if they know that they are taking the placebo or medication.

The prospective randomised single blind study was conducted at ordu university training and research hospital ordu turkey from january 1 to june 30 2015 and comprised boys aged 6 12 years who were scheduled to undergo circumcision operation. Example of a single blind study for example imagine that researchers are doing a study to determine if a certain type of medication causes people to feel more alert.

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