No it's not. Why does it matter if a 4 year old doesn't know what a vegetable is? 4 year old don't know what a bank is, or how many days are in a year, why does

No it's not. Why does it matter if a 4 year old doesn't know what a vegetable is? 4 year old don't know what a bank is, or how many days are in a year, why does it matter? If the sample was only 7 year old kids i would agree, but this sample is irrelevant.