"Simpson's paradox, which also goes by several other names, is a phenomenon in probability and statistics in which a trend appears in several groups of data but

"Simpson's paradox, which also goes by several other names, is a phenomenon in probability and statistics in which a trend appears in several groups of data but disappears or reverses when the groups are combined. " In this case, the effect when the data is separated out is that AP is only marginally safer. When they are combined, it appears to be significantly safer. I'd say this isn't a case of simpsons paradox at all.