Investigators have proposed a screening method for asthma using exhaled nitric oxide (eNO). Ninety (90) participants were recruited. Twenty-three (23) participants had asthma, and 67 participants did not have asthma. Among the 23 persons with asthma, 21 persons had a positive eNO screening test. Among the 67 persons without asthma, 20 had a positive eNO screening test. [Based on "Exhaled nitric oxide in the diagnosis of asthma: comparison with bronchial provocation tests" Berkman N, Avital A, Breuer R, Bardach E, Springer C, Godfrey S. Thorax (2005); 60:5 383-388. ] a) Find the sensitivity of the eNO screening test b) Find the specificity of the eNO screening test