posted by .

Please point me in the direction of being able to describe the structure of a "double-blind" experiment.

  • Psychology -

    I went to and entered double-blind experiment, and here are the results:

  • Psychology -

    I did that - but was lost as to how to describe the structure of well developed double blind study.

  • Psychology -

    It has something to do with how neither the researchers nor the participants are fully aware of the situation.

  • Psychology -

    An independent variable is the potential stimulus or cause, usually directly manipulated by the experimenter, so it could also be called a manipulative variable.

    A dependent variable is the response or measure of results.

    Extraneous variables — other than the independent variable — potentially can affect the dependent variable, so they must be controlled. If possible, you try to keep them constant between the experimental and control group.

    The experimental group receives the independent variable.

    The control group is similar to experimental, except it does not receive the independent variable. Extraneous variables are balanced between experimental and control groups.

    Types of experiments

    1. Single blind gives the control group a placebo — a substance that is inert, it has no physical effect. Subjects don't know if they are in experimental or control group to reduce placebo effect, a change in behavior solely due to believing that you are getting the independent variable.

    2. Double blind keeps both subjects and experimenter ignorant of group setup. Distribution of the independent variable and placebo are controlled by third party. This controls for experimenter bias and self-fulfilling prophecy, which means that experimenters with particular expectations are likely to consciously or unconsciously to bias the experiment and influence it to conform to their expectations.

    As an example, suppose you want to find out if fluorides reduce dental cavities. You would find two groups, trying to control the extraneous variables. Extraneous variables are found by surveying previous research in the area. In this case, you would match the groups in terms of previous history of cavities, diet and dental hygiene habits including how and how often they brush their teeth.

    The experimental group would get toothpaste with the independent variable, the fluoride, while the control group would not have the fluoride in their toothpaste. The toothpaste without the fluoride would be the placebo.

    The dependent variable would be the number of cavities after participating in the experiment for a time. The dependent variable indicates the results, but it is not the results. At the end of the experiment, both groups could have no change in cavities or one of the groups could have a greater reduction in cavities. (Of course, if the fluoride increased cavities, you wouldn't want to use it.) All of these varied results would be indicated in terms of the dependent variable.

    If only the subjects do not know who is getting the fluoride, it is a single blind experiment. If both the subjects and experimenter do not know, it is a double blind.

    I hope this helps a little more. Thanks for asking.

Respond to this Question

First Name
School Subject
Your Answer

Similar Questions

  1. Physics Gr11 Light Unit - Blind spot

    We are doing an experiment measuring the diameter of your blind spot. (1)Why is it normally impossible for a person to completely lose sight of something in their blind spots?
  2. Psychology

    When you use procedures like placebos and double-blind conditions, you are attempting to set up ____ for factors that would make your experimental findings questionable. A. controls B. treatments C. selections D. cases
  3. Math

    There are two main classes of individuals who can affect the outcome of an experiment: Those who could influence the results Those who evaluate the results When all the individuals in either one of these classes are blinded, an experiment …
  4. psychology

    Which of the following statements about psychological experiments is MOST accurate?
  5. psychology

    When an experimenter's expectations about a behavior influence the results of his experiment, it is called a a.placebo effect b.self-fulfilling prophecy c.single-blind experiment d.double-blind experiment
  6. Statics

    I have a structure that is constructed of circular rod that has a mass of 7 kg per meter of length. I must determine the moment Mo about O caused by the weight of the structure. From the origin (O), the structure is 2m tall (z direction), …
  7. Statistics

    The manufacturer of Sleepeze has asked you to test the effectiveness of the drug. You decide to test the effectiveness using the drug and a placebo. You select a select a group of 500 subjects and randomly assign them to either the …
  8. Chemistry

    Describe 3 experiments, run prior to 1930, and the types of energies/particles used to probe the structure of the atom. What did each experiment investigate?
  9. History

    9.)Though life in the late 1700's was completely different for most white women & slaves, what one thing did they typically have in common?
  10. Organic chemistry

    How would I draw the structure for (3e,5z)-6-bromo-3-fluoro-3,5-nonadiene?

More Similar Questions