biology

posted by .

help me to do an research design

  • biology -

    ?? incomplete post??

  • biology -

    Since you question lacks necessary details, perhaps some review of the experimental method might be helpful.

    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. If not, repost with more details. Thanks for asking.

Respond to this Question

First Name
School Subject
Your Answer

Similar Questions

  1. Research

    If you were to design a research study at your work can you give examples of dependent and independent variables along with any extraneous variable
  2. research

    If you were to design a research study at your work (hospital setting) can you give examples of dependent and independent variables along with any extraneous variable
  3. design

    In an effort to promote a better understanding of what design is and how to discuss it, your firm is having a weekly series of meetings. Within your first week, please find a design to include in your presentation that is different …
  4. Research and Design

    over the course of five weeks, you will research and prepare a design proposal for a green company
  5. marketing

    Define one specific problem it could address through marketing research. What type of research design do you recommend for addressing that problem, and why?
  6. Marketing

    Select a company that produces a product that you use and with which you are familiar. For the company to make decisions about developing new products and attracting new customers, it must rely on marketing research. These decisions …
  7. Research Design

    I need help describing the similarities and differences between quantitative and qualitative research.
  8. soc

    A graduate student at Big State University has begun data collection for a thesis project in which she is asking students about their use of social networking websites. Her primary interest is in determining how often students use …
  9. psychology

    A hypothesis is what an investigator uses to: duplicate research findings of other scientists. frame his/her research question. explain why he/she obtained a certain result from an experiment. define the parameters of a research study. …
  10. Art

    Movie professionals such as props desginers and graphic designers work together to create a believable film. Which method of creating a believable screenplay is unique to the job of a screenwriter. A. research of time period architecture …

More Similar Questions