http://en.wikipedia.org/wiki/External_validity http://en.wikipedia.org/wiki/External_validity external validity English external validity External validity generalizability external validity external validity external validity external validity more from Wikipedia can’t necessarily be applied to external validity התקפות החיצונית external external validity http://en.wikipedia.org/wiki/External_validity external validity external validity external validity English http://en.wikipedia.org/wiki/External_validity nonrandom, nongeneralizable external validity nonrandom, nongeneralizable external validity external external validity external validity external validity external validity external validity http://en.wikipedia.org/wiki/External_validity external validity Wikipedia English התקפות החיצונית English nonrandom, nongeneralizable external validity