Suppose the physician and school nurse came up with the following data:

Nurse's Diagnosis		Physician's Diagnosis
	Heart disease Yes	Heart disease No		Heart disease Yes	Heart disease No
Positive	180	200	Positive	190	160
Negative	20	600	Negative	10	640

What is the sensitivity of the nurse's exam?

a. 75%

b. 80%

c. 90%

d. 96%

What is the specificity of the physician's exam?

a. 75%

b. 80%

c. 90%

d. 85%

Is the positive predictive value of the nurse's exam higher, lower or the same as the physician's exam?

a. higher

b. lower

c. the same

d. cannot tell from the data provided.

If the tests were conducted in sequence with only those students who the nurse diagnosed as positive were examined by the physician what would be the net specificity of the exams?

a. 85%

b. 90%

c. 95%

d. 98%

If the tests were conducted simultaneously, what would be the net sensitivity of the two exams combined?

a. 90%

b. 95%

c. 98.2%

d. 99.5%