Question: How would you randomize, for a two sample test, in each of the following cases? (a) Forty combustion engines are available for a speed test

How would you randomize, for a two sample test, in each of the following cases?

(a) Forty combustion engines are available for a speed test and you want to compare a modified exhaust valve with the regular valve.

(b) A new cold storage freezer will be compared with the old. Twenty jugs of water are available for freezing.

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