Listed below are amounts of strontium-90 (in millibecquerels, or mBq, per gram of calcium) in a simple random sample of baby teeth obtained from Pennsylvania residents and New York residents born after 1979. Use a 0.05 significance level to test the claim that amounts of strontium-90 from Pennsylvania residents vary more than amounts from New York residents.
Assume that both samples are independent simple random samples from populations having normal distributions.
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