The variability in the amount of impurities in a batch of chemical depends on the length of its process time. A manufacturer using two production lines, 1 and 2, has made a slight adjustment to line 2, hoping to reduce the variability in the amount of impurities. Samples of 25 1 n 5 and 25 2 n 5 measurements from the two batches yield these means and variances:

Do the data present sufficient evidence to indicate that the process variability is less for line 2?

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x=3.2 s=1.04 x=3.0 $2.51