Quantity of the sample样本数量

( pointing out that the current sample is too small in its size)(the fact cited by the author) could hardly illustrate the assumption that... because the author provides only N samples of (the general population),however, (the limited sample) might not be representative of the whole general group. thus we cannot accept the author’s conclusion that...before he/she could provide more statistic data about (the situation of other sub-groups).