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.

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