#### Null hypothesis

A maintained hypothesis or conjecture
is called the null hypothesis and it is denoted as Ho. The researcher also defines
an alternative hypothesis, which in practice is the state of nature that the
researcher believes to be true.

The objective of hypothesis testing
is to show evidence against the null hypothesis.

For instance, a researcher believes
that the average weekly consumer expenditures on food in the state of Florida
is less than $100. Therefore, the null hypothesis would be in this case that
the average weekly consumer expenditures is at least $100. Using sample information
the objective of hypothesis testing is to find evidence against this null hypotesis,
lending support to the alternative hypothesis.

The typical analogy in the judicial
system, when evidence is presented against a defendant, defines the null hypothesis
that the defendant is innocent.

Additional
information on the null hypothesis can be found in David Lane's text.

##### Reference

HyperStat Online. Copyright
© 1993-2001 David M. Lane.