1. Researchers at the National Cancer Institute released the results of a study that examined the effect of weed-killing herbicides on house pets. (Associated Press, Sept 4, 1991). Dogs, some of whom were from homes where the herbicide was used on a regular basis, were examined for the presence of malignant lymphoma. The data are compatible with summary values given in the report:

Group Sample Size Number with Lymphoma

Exposed 827 473

Unexposed 130 19

A. Is there convincing evidence that there is a difference between the two groups?

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jQuery22404013487413254695_1589547075997: (4 points each)

B. P-value vs. (2 points each)

C. From this data, can we conclude at the 5% alpha level, that there is convincing evidence to support that there is a difference between the dogs that were exposed to the herbicide as opposed to the dogs that were not exposed?

Choose One

Reject the Null Cannot reject the null (3 points)

D. Write the conclusion in context, using your blanket statement. (5 points)

E. Write a 95% confidence interval statement for the difference (5 points) in the proportion of the two groups.