You assume it has fatter tails.

你假设它有更肥的尾巴。

But it also has fatter tails.

但它也有更肥的尾巴。

So a T-distribution looks very similar to a normal distribution but it has fatter tails.

所以 T 分布看起来与正态分布非常相似，但它的尾巴更肥。

And it has fatter tails because you're essentially underestimating-- you're underestimating the standard deviation over here.

它有更粗的尾巴，因为你基本上低估了——你低估了这里的标准差。

And the way I think about why it has fatter tails is when you make an assumption that this is a standard deviation for-- let me take one more step.

我思考为什么它有更粗的尾巴的方式是当你假设这是一个标准偏差——让我再走一步。