You are using a Guest account. Some functionality has been disabled. Register

Test for one mean calculator

Test for one mean calculator

Observed mean

Null hypothesis value

Computational notes

This procedure calculates the difference of an observed mean with a hypothesized value. A significance value (P-value) and 95% Confidence Interval (CI) of the observed mean is reported. The P-value is the probability of obtaining the observed mean in the sample if the null hypothesis value were the true value.

The P-value is calculated using the one sample t-test, with the value t calculated as:


or when the hypothesized mean is k and the standard deviation is s:


The P-value is the area of the t distribution with n−1 degrees of freedom, that falls outside ± t (see Values of the t distribution table).


  • Altman DG (1991) Practical statistics for medical research. London: Chapman and Hall.
Help Close Help Full window