We do not know the actual standard deviation in our population.

我们不知道人口中的实际标准偏差。

If you were to take the square root of that our actual sample standard deviation is going to be, let's take the square root of that answer right over there, and we get 0.496 is equal to 0.

如果你要对我们的实际样本标准差求平方根，让我们对那边的答案求平方根，我们得到 0.496 等于 0。