Null Hypothesis - Testing For Differences

Testing For Differences

In scientific and medical research, null hypotheses play a major role in testing the significance of differences in treatment and control groups. This use, while widespread, offers several grounds for criticism, including straw man, Bayesian criticism and publication bias.

The typical null hypothesis at the outset of the experiment is that no difference exists between the control and experimental groups (for the variable being compared). Other possibilities include:

  • that values in samples from a given population can be modeled using a certain family of statistical distributions.
  • that the variability of data in different groups is the same, although they may be centered around different values.

Read more about this topic:  Null Hypothesis

Famous quotes containing the words testing and/or differences:

    Traditional scientific method has always been at the very best 20-20 hindsight. It’s good for seeing where you’ve been. It’s good for testing the truth of what you think you know, but it can’t tell you where you ought to go.
    Robert M. Pirsig (b. 1928)

    No sooner had I glanced at this letter, than I concluded it to be that of which I was in search. To be sure, it was, to all appearance, radically different from the one of which the Prefect had read us so minute a description.... But, then, the radicalness of these differences ... these things ... were strongly corroborative of suspicion.
    Edgar Allan Poe (1809–1849)