what is Internal Validity?

  • 0 votes

My teacher told me its 'how true/real the experiment is' but that makes no sense to me :') please help :)

Posted Fri 28th December, 2012 @ 15:32 by Anya kelly

1 Answer

  • 3 votes

It's basically whether or not an experiment is a 'true' test of what it aims to be measuring. So, if there were lots of other variables present that weren't controlled, the internal validity would be low because the results might be due to these, rather than the independent variable that was being manipulated. So it wouldn't really be measuring what the experiment set out to measure. 

Likewise, if other variables are carefully controlled, you can be more sure that the results are due to the independent variable (the one being manipulated), so you can say it has high internal validity and that it's a 'true' measure of what it says it's measuring. Hopefully that makes a bit more sense :) 

Answered Fri 28th December, 2012 @ 16:11 by e