11. Pets. Researchers at the National Cancer Institute
Chapter 22, Problem 11(choose chapter or problem)
11. Pets. Researchers at the National Cancer Institute releasedthe results of a study that investigated the effect ofweed-killing herbicides on house pets. They examined827 dogs from homes where an herbicide was used on aregular basis, diagnosing malignant lymphoma in 473 ofthem. Of the 130 dogs from homes where no herbicideswere used, only 19 were found to have lymphoma.a) Whats the standard error of the difference in the twoproportions?b) Construct a 95% confidence interval for this difference.c) State an appropriate conclusion.
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