Question

3. Listed below are the 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
(based on data from “An unexpected rise of strontium – 90 in US Deciduous Teeth in the 1990s,” by Mangrano,
et. al., Science of Total Environment). (Use 3 decimal places)
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
A. Use 0.05 level of significance to test the claim that the mean amount of strontium – 90 from Pennsylvania
residents is greater than the mean amount from New York residents. (Perform the steps in hypothesis testing.
Make sure that the 5 steps are clearly shown in your work) (10 pts)
A. Hypotheses:

B. Test Statistic

C. Critical Value

P – value: _______________

D. Decision Rule

E. Conclusion

Answer 1