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             Null Hypothesis

What is the null hypothesis?  Below is a definition of the
null hypothesis.

Null Hypothesis Definition

The null hypothesis is the opposite of the alternative
hypothesis.  If the alternative hypothesis is the belief
that the independent variable has an effect on the
dependent variable, then the null hypothesis is the
belief that the independent variable in an experiment
has no effect on the dependent variable.


Null Hypothesis Example

    
There are a number of possible examples of the null
hypothesis.   Imagine that your research question
concerns the influence of humor in ads on sales.  The
null hypothesis would be the belief that humor in ads
will have no effect on sales.