1. In a case-control study, exposure status was misclassified as follows:

Study Population without Misclassification
	Cases	Controls
Exposed	500	500
Unexposed	250	1000
Study Population with Misclassification
	Cases	Controls
Exposed	A 250	B 250
Unexposed	C 500	D 1250

C. If there is evidence of information bias, is it differential or nondifferential? Explain why by comparing the errors in misclassification of exposure between the cases and controls.

D. If there is information bias, is it towards OR away from the null? Why?