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Methods of sample selection and allocation of individuals to groups in group comparison experiments to calculate average individual differences (external validity) and population representativeness (internal.

Careful replication is performed if there are suspected errors in the main experiment. Replication versus replication: Replication assesses whether the same experiment yields consistent results.

The characteristics of the study sample match those of the general population. This is achieved by randomly selecting an individual from the population (a randomization.

Selection or randomization strategy. where all subjects have an equal chance of joining the group. It is used in the selection of the population in.

The main source of internal consistency violations in psychometric group experiments. In group comparison designs. it is necessary to equalize groups according to controlled characteristics.