In a series of experiments on the determination of tin in canned food, samples were boiled with nitric acid under reflux for different times. Some of the results are shown below: Boiling time 25 min Boiling time 45 min 38.5 40.4 43.1 42.9 40.9 42.8 42.6 36.8 41.4 41.7 40.7 41.6 36.1 39.2 42.2 42.1 the precision of the experiment at boiling time 25 min significantly different than from boiling time 45 min. Use α=0.05.

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