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|Table of Contents Statistical Tests Means Comparing means|
|See also: survey on statistical tests, t-distribution|
A second distinction has to be made with respect to the sample size. Given a large (>30) sample size, we can assume the estimate of the standard deviation is fairly accurate. In the case of fewer samples, this assumption is not valid and we have to use the t-distribution. However, one could also use the t-distribution for a large number of samples, since the t-distribution approaches the normal distribution with an infinite number of values.
Depending on what is to be compared, there are several choices:
Last Update: 2005-Jul-16