Epidemiology

1. A diagnostic test with a negative predictive value of 0.75 means that of those patients testing negative, 75% actually have the disease. True or False?

2. A diagnostic test with a sensitivity of 0.5 and a specificity of 0.5 means that a patient receiving such a test has a 50% probability of truly having the disease if testing positive and a 50% probability of not having the disease if testing negative. True or False?