“…Past studies have identified consistent correlates with DK responses, and respondents with certain characteristics are found to be more likely t o g i v e D K r e s p o n s e s t h a n o t h e r s i n a t t i tudinal and opinion surveys. In particular, researchers have found that females, nonwhites, low-educated, low-income, and noninvolved respondents with feelings of low political efficacy give a predictably high number of DK responses (Francis and Busch, 1975;Faulkenberry and Mason, 1978;Pickery and Loosveldt, 1998;Singer et al, 2000;Krosnick et al 2002;Stocke, 2006).…”