A new screening test for Lyme disease is developed for use in the general population. The sensitivity and specificity of the new test are 60% and 70%, respectively. Three hundred people are screened at a clinic during the first year the new test is implemented. Assume the true prevalence of Lyme disease among clinic attendees is 10%.
1. Calculate the following values:
a. The predictive value of a positive test is ___________.
b. The predictive value of a negative test is ___________.