has specified output achieves_planned_objective p-value statistical hypothesis test statistical hypothesis test objective Student's t-test WEB: http://en.wikipedia.org/wiki/T-test Student's t-test James Malone Studen't t-test is a data transformation with the objective of a statistical hypothesis test in which the test statistic has a Student's t distribution if the null hypothesis is true. It is applied when the population is assumed to be normally distributed but the sample sizes are small enough that the statistic on which inference is based is not normally distributed because it relies on an uncertain estimate of standard deviation rather than on a precisely known value. metadata incomplete