
It is my understanding (please correct me if I'm wrong, those of you who know for sure) that the WPPSI is in fact normed for American children. , so in the above example, you're right; if a British child thought of "waiting in line" as "queuing up," then they might be at a disadvantage, but I do not believe they are the target audience. |
A few basic facts:
The norming group (where the percentiles are established) is controlled and done under strict conditions - no nudging allowed. This is a different group from the group the test is used from. So, of the norming group, it is absolutely, positively true that 1% scored at the 99th percentile. No guarantees for the group now being assessed. The way the test is scored, the raw score (# correct) is translated into an age-based standard score, which can translate into a percentile. A generous scorer (whatever their motivation) might err on the positive on a few borderline answers, which might cumulatively nudge the child up a percentile or two. The Information subtest does ask factual questions about general knowledge, so coming from a home with books/educational tv/lots of conversation can help on that particular subtest. No reasoning involved on this one (although really bright kids can sometimes reason their way to a correct answer). Most of the other tests are less dependent on background knowledge, but it can play a part. This is one reason the WPPSI is a less good predictor of future scores than, say, a WISC at age 8 - by then the kids are reading and in school, picking up knowledge independent of their parents (it's also why some parents who really enriched their young children are crushed when, four years later, the kid's scores are lower - relative to their peers, the edge given by enrichment has worn off some). A kid who grew up abroad/has foreign born parents/is from a nonEnglish speaking home will be at some magnitude of disadvantage, but if the child is fluent in English the disadvantage is likely small. |