FDG
pathwise dependent
- Joined
- Aug 13, 2007
- Messages
- 5,903
- MBTI Type
- ENTJ
- Enneagram
- 7w8
IQ means something... but an average difference of 2 points in IQ between first/second born is negliable considering the normalized standard deviation of IQ tests are fixed at 11. The tiny different there, to me, means nothing more than a sampling error. Unless there's more info given on the data... ie SE/variance, the average IQ scores can't be compared.
Agreed, we should have all the info on how the data has been collected and crunched to see if it's significant. In fact, the article hasn't stated if the statiticians have claimed it to be significant or otherwise.
I think it's been said before in a post that there's a correlation between language ability and time a parent spends with the child. This means that in order to more accurately test if the impact is sweked towards this factor, they should control for age difference between siblings.