Listed below are amounts of strontium-90 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 the median amount of strontium-90 from Pennsylvania residents is the same as the median from New York residents.

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Pennsylvania 155 142 149 30 53 142 156 133 138 161 New York 133 140 142 13 134 129 128 140 140 140 137 143