Question: To test wether the mean time to mix a batch of adhesive is the same for machines produced for four manufacturers, TiteBondMax obtained DATA on

To test wether the mean time to mix a batch of adhesive is the same for machines produced for four manufacturers, TiteBondMax obtained DATA on the time (minutes) needed to mix the materials. Test wether the machines have equal mean mixing time at alpha = 0.01.

DATA:

Manufacturer

A B C D

25 23 25 22

23 21 25 23

21 23 25 23

23 24 21 22

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