science

posted by .

the ? is the part of an experiment that is not being tested and is being used for comparison.

  • science -

    CONTROL?

  • Science -

    This might help you understand the experimental method better.

    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. Thanks for asking.

  • science -

    It is the CONTROL.

Respond to this Question

First Name
School Subject
Your Answer

Similar Questions

  1. SCIENCE

    WHAT IS THE PART OF AN EXPERIMENT THAT IS NOT BEING TESTED AND IS USED FOR COMARISON control group
  2. Science

    1. The ? is the part of an experiment that is not being tested and is used for comparison. (7 words) 2. The ?
  3. Science

    a few questions; 11 letters. observations involving verbal descriptions. 20 letters. the last one being t. an experiment where only one variable is changed and all others are kept constant. 16 letters. the first being s, the fourteenth …
  4. biology

    What is the variable being tested in an experiment called?
  5. Math

    a technician draws 10 cc of a patients blood to be tested for cholesterol and for red blood cells. identify a.the sample b.the population c. the variable being studied i attempted but im not sure if its right...i said a) the 10 cc …
  6. English

    Could you please check these sentences? Thank you. 1) Have you thought about (of?
  7. language arts

    she needed a hook a line that would make the audience feel singers isolation. Q. what is the meaning of the word isolation as it is used in this sentence A. being alone b. being angry c. being restless d. being confused i don't understand …
  8. Ka

    she needed a hook a line that would make the audience feel singers isolation. Q. what is the meaning of the word isolation as it is used in this sentence A. being alone b. being angry c. being restless d. being confused i pic B am …
  9. science

    1. In paper chromatography, is the substance being tested the solute or solvent?
  10. Science

    1. In paper chromatography, is the substance being tested the solute or solvent?

More Similar Questions