Principle of Replication in Experiments

To introduce variability and complexity into the study design

To conduct the experiment without any control or planning

To increase the precision of a study and estimate main effects and interactions accurately (correct)

To decrease the accuracy of the main effects and interactions

It protects against deliberate manipulation of extraneous factors

It protects against the chance variation caused by extraneous factors (correct)

It protects against the effects of extraneous factors by introducing variability

It protects against the accurate estimation of main effects and interactions

Dividing the field into several homogeneous parts known as 'blocks' (correct)

Measuring the contribution of treatments to the total variability of the data

Deliberately introducing variability caused by extraneous factors

Eliminating all sources of variability from the experimental error