"Response rates for this data collection were relatively low, both for the United States and for several other participating countries. There is evidence that procedures implemented to reduce bias associated with nonresponse have done so, and that the data are representative of the population. However, readers should be aware of the potential for bias and use caution when interpreting PIAAC results."

These stats don't pass the smell test. About a third of people in the US have a bachelor's degree, but only 13% can pass level 4/5 literacy challenge? If you dig into the sample questions, they are not hard. A level 4 task has the person read a short article and pull out the criticisms of some products.

I know not everyone with a bachelor's degree is 'smart' but it's hard to believe 2/3rds couldn't pass level 4/5.

Also 13% have a master's degree, does that mean those 13% are the only people passing level 4/5?

https://en.wikipedia.org/wiki/Educational_attainment_in_the_...