Definition of Replication:

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Replication occurs when an experimental treatment is set up and conducted more than once. If you collect two data points at each treatment, you have two replications. In general, plan on making between two and five replications for each treatment.

Replication is a repeat of the experimental run such that the repeated run only occurs after a full breakdown of ‘SET UP’ and ‘SET POINTS’. This requires an additional ‘SET UP’ and the establishment of ‘SET POINTS’ even if the prior experimental run was with these exact ‘SET POINTS’.

On the contrary Repetition is making a repeat of the experimental run and taking an immediate additional sample without breaking down the ‘SET UP’ or changing the ‘SET POINT’

Replication is done to reduce the impact of the inherent variation in the process, whereas repetition reflects the uncontrolled variability in the measurements.

In other words Repetition is equivalent to Repeatability, whereas Replication is equivalent to Reproducibility.

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