S1, our sample standard deviation for group one is 4.67.

S1，我们第一组的样本标准差是 4.67。

So my sample standard deviation is 0.50.

所以我的样本标准偏差是 0.50。

And the standard deviation of these 10 data points right here is 2.98, the sample standard deviation.

这 10 个数据点的标准偏差为 2.98，即样本标准偏差。

But we were able to estimate it with the sample standard deviation.

但是我们能够用样本标准差来估计它。

My sample standard deviation is just going to be the square root of my sample variance.

我的样本标准差只是样本方差的平方根。

And if I want to figure out my sample standard deviation I just take the square root of that.

如果我想计算出我的样本标准偏差，我只需对其求平方根。

The sample standard deviation of group two squared.

第二组的样本标准差平方。

If you take your sample standard deviation, 4.67 and you square it, you get your sample variance.

如果您取样本标准差 4.67 并将其平方，则得到样本方差。

Plus my sample standard deviation for the control squared, which is the sample variance.

加上我的控制平方样本标准偏差，即样本方差。

And then you can also calculate your sample standard deviation.

然后你还可以计算你的样本标准偏差。

So our sample mean for group one is 9.31 pounds, with a sample standard deviation of 4.67.

因此，我们第一组的样本平均值为 9.31 磅，样本标准差为 4.67。

We can estimate the true standard deviation of the population with our sampling standard deviation, which was 0.5, 0.5 divided by 10.

我们可以用我们的抽样标准偏差来估计总体的真实标准偏差，即 0.5，即 0.5 除以 10。

So we've been estimating the true standard deviation of the population with our sample standard deviation.

所以我们一直在用我们的样本标准差来估计总体的真实标准差。

So that is our sample standard deviation.

这就是我们的样本标准偏差。

So if we don't know that the best thing we can put in there is our sample standard deviation.

因此，如果我们不知道我们可以放入的最好的东西就是我们的样本标准偏差。

So if this can be estimated it's going to be estimated by the sample standard deviation.

所以如果这可以估计，它将通过样本标准差来估计。

So this is going to be our sample standard deviation one squared, which is the sample variance for that distribution, over 100.

所以这将是我们的样本标准偏差的平方，这是该分布的样本方差， 超过 100。

So we know our sample standard deviation is 1.04.

所以我们知道我们的样本标准差是 1.04。

And so then the sample standard deviation is just going to be the square root of that.

因此，样本标准差就是它的平方根。

And this t-table assumes that you are approximating that standard deviation using your sample standard deviation.

此 t 表假设您使用样本标准差来近似标准差。