A firm producing plate glass has developed a less-expensive tempering process to allow glass for fireplaces to rise to a higher

Question

A firm producing plate glass has developed a less-expensive tempering process to allow glass for fireplaces to rise to a higher temperature without breaking. To test it, five different plates of glass were drawn randomly from a production run, then cut in half, with one-half tempered by the new process, and the other half by the old. The two halves were then heated until they broke. The change in breaking strength was measured, new-old, for each pair. 
This is an example of
a matched pairs design.
replication.
a completely randomized design.

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