The following table shows the female physicians in the United States cross classified by age and specialty.

	Under 35	35-45	45 or over	Total
Family Practice	5842	6797	2828	15467
Internal Medicine	11799	12838	5864	30501
Obstetrics/Gynec.	4454	4857	2202	11513
Plastic Surgery	85	262	131	478
Total	22180	24754	11025	57959

Are age and specialty independent? NO

YES

There is not enough information to answer

Are age and specialty disjoint? YES There is not enough information to answer NO

The International Shark Attack File, maintained by the American Elasmobranch Society and the Florida Museum of natural history, is a compilation of all known shark attacks around the globe from the mid 1500s to the present. Following is a table providing a cross-classification of worldwide reported shark attacks during the 1900s, by country and lethality of attack

	Fatal	Nonfatal	Total
Australia	9	56	65
Brazil	12	21	33
South Africa	8	57	65
United States	5	244	249
Other	36	92	128
Total	70	470	540

Suppose a shark attack is chosen from the compilation at random.

Are the events "from Australia" and "fatal" independent? Yes NO