Scuse me if I get the psychology wrong.

Wouldn't an hammer be many, many people's first idea of a tool? (Cause it's a common tool)

Wouldn't be red often be the first color that comes to mind? (Cause it's many people's favorite color or something)

Where was the statistical sample for this based? How big was it?

Was it adjusted for possible cultural bias? (Especially if the math thing is an integral part of the test, I personnally believe that 15+6 = Vingt et un, most of you think it's twenty one...)

'tienne