Independent Measures Design

Classic Designs

Data for the experimental and control group used to be listed in columns of a table as, e.g.,

Descriptive statistics were computed and used in a formula for obtaining the t-ratio which associated probability was looked up in a table.

Coded Designs

Within the coded design, group membership is indexed by the parent vector and the obtained data are listed in the adjacent column, as, e.g.,

The obtained results are typically displayed in a tabular form as

The obtained t-ratio and its associated degrees of freedom are dragged into the visual representation of the t-distribution with either symmetric or asymmetric critical areas (Tables, t Distribution with Asymmetric Critical Area)

 and the obtained probability (.145) is dragged back to the table of results.