Listed below are amounts of strontium-90 (in millibecquerels, or mBq, per gram of calcium) in a simple random sample by baby teeth obtained from Pennsylvania residents and New York residents born after 1979. Use a 0.05

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Listed below are amounts of strontium-90 (in millibecquerels, or mBq, per gram of calcium) in a simple random sample by baby teeth obtained from Pennsylvania residents and New York residents born after 1979. Use a 0.05 significance level and Wilcoxon rank-sum test 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 155 142 149 130 151 163 151 142 156 133 138 161
New York 133 140 142 131 134 129 128 140 140 140 137 143

1. what is the exact value of R = R 1  (Pennsylvania)? (Round off to 1 decimal place.)

2. what is the value of μ R ? (Type as a whole number.) 

3. what is the value of σ R ? (Round off to 2 decimal places.)

4. what is the computed value of z ? (Round off to 2 decimal places.)

5. what is the tabular value of z ? (Round off to 2 decimal places.

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