Statistics question?

Question

Lucy surveys the students in her class and finds that the average math mark of females is higher than that of males. She concludes that females are better in math than males. Samantha's study is flawed because:

a) her sample size was not large enough
b) she did not say how much higher was the females’ average mark

Answer 1

i think both can be right answers, but i would argue B is the better answer, assuming our sample size are more or less equivalent

with B, we are talking about the magnitude we want to consider for an accepted hypothesis

Answer 2

Because she's not Lucy?

I think you could phrase this more clearly ...