Two chemical companies can supply a raw material. The concentration of a particular element in this material is important. The mean concentration for both suppliers is the same, but you suspect that the variability in concentration may điffer for the two companies. The standard deviation of concentration in a random sample of n, = 10 batches produced by company 1 is s, = 4.7 grams per liter, and for company 2, a random sample of n, = 16 batches yield s, = 5.8 grams per liter. Is there sufficient evidence to conclude that the two populations variances differ? Use a = 0.05. O a. None among the choices Ob. Because 0.321 < 0.657 < 3.77, fail to reject the null hypothesis O. Because 0.265 < 0.657 < 3.12, fail to reject the null hypothesis O d. Because 0.386 < 0.657 < 3.01, fail to reject the null hypothesis

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