1.The following table shows the results of a screening test hypothesized to identify persons at risk for a rare blood disease. Compute the False Positive Fraction of the test.

	No Disease	Disease
Screen Negative	1351	20
Screen Positive	39	41

2. The following data were collected in a survey of 8th graders and summarize their cell phone status. What proportion of the 8th graders have cell phones?

	No cell phone	Conventional cell phone user	Smart phone user
Boys	50	65	33
Girls	31	76	27

3. The following table shows the distribution of BMI in children living in United States and European urban neighborhoods. (The data are in millions.) What is the probability that a child living in a U.S. urban neighborhood is obese?

Neighborhood	Normal Weight	Overweight	Obese
United States	125	50	40
Europe	101	42	21

4. The following table shows the numbers of patients classified as underweight, normal weight, overweight and obese according to their diabetes status. What is the probability that a patient selected at random is obese?

	Underweight	Normal Weight	Overweight	Obese
Diabetes	8	34	65	43
No Diabetes	12	85	93	40