41. Four laboratories (1–4) are randomly selected from a large population, and each is asked to make three determinations of the percentage of methyl alcohol in specimens of a compound taken from a single batch. Based on the accompanying data, are differences among laboratories a source of variation in the percentage of methyl alcohol? State and test the relevant hypotheses using significance level .05.

1: 85.06 85.25 84.87 2: 84.99 84.28 84.88 3: 84.48 84.72 85.10 4: 84.10 84.55 84.05