Read the following premise and answer if the hypothesis is true.
The so-called "grandmother hypothesis", based on studies of African hunter-gatherer groups, suggests that infertile women are vital for successful child-rearing despite being unable to produce children themselves.
Hypothesis: The "grandmother hypothesis" was formed while studying European settlers.. Is the answer "Yes", "No", or "It's impossible to say"? Respond with only the answer and no additional text.
No
It's impossible to say.