Creatinine levels in individuals without kidney disease are normally distributed with population mean (no disease) 0.9 mg/dL and population standard deviation (

) 0.2 mg/dL. A researcher collects data on serum creatinine levels in 16 men with chronic kidney disease and finds that the sample mean serum creatine level is 1.1 mg/dL

A researcher proposes using the value 1.1 mg/dL as the cutoff for screening for kidney disease (i.e. >1.1 is a screen positive), what is the specificity of this screening procedure?

• 68%
• 16%
• 84%
• >99%
• 32%