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A study of dust lead levels and lead poisoning in children was conducted. Of the 200 cases of lead poisoning, 50 had high dust lead levels in their homes.

A study of dust lead levels and lead poisoning in children was conducted. Of the 200 cases of lead poisoning, 50 had high dust lead levels in their homes. Of the 200 controls, 30 had high dust lead levels in their homes. 1. What is the study design? 2. What measure of comparison should be used to estimate the strength of the relationship between high dust lead level and lead poisoning? 3. Set up the 2X2 table and calculate this measure of comparison. 4. What is the literal interpretation of your measure of comparison? 5. Name the three possible sources of error for this finding. 6. What is the null hypothesis for this study? 7. The 95% conﬁdence interval for the measure of comparison was 0.8 to 3.0. Are the study results above compatible with the null hypothesis? Why of why not?

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