A fish-processing company is concerned about the shelf life of its new cat food. A sample examined in Halifax (n = 35) had an acceptable mean shelf life of 13 months, with a standard deviation of 1.44 months. But a second sample, examined in Dartmouth (n - 40), had a mean shelf life of only 11 months, with a standard deviation of 1.52 months. At the 0.05 level of significance, test the claim that shelf lives at both plants have the same standard deviation.