So the mean of the sampling distribution of the sample mean, we'll write it like that.

所以样本均值的抽样分布的均值，我们会这样写。

So the mean of the sampling distribution of the sample proportion.

所以样本比例的抽样分布的均值。

This is also the same thing as the mean of the sampling distribution of the sampling mean is in that interval.

这也和抽样均值的抽样分布的均值在那个区间是一回事。

It's the same thing as the mean of the difference of the means of the sampling distributions.

这与抽样分布均值之差的均值是一回事。

This, right here-- if we can just get our notation right-- this is the mean of the sampling distribution of the sampling mean.

这个，就在这里——如果我们的符号正确的话——这就是抽样均值的抽样分布的均值。

We don't know the true mean of the sampling distribution, and we also don't know the true standard deviation of the sampling distribution.

我们不知道抽样分布的真实均值，也不知道抽样分布的真实标准差。

And the mean of the sampling distribution of the sample mean is going to be the same thing as the population mean.

样本均值的抽样分布均值将与总体均值相同。

So the population mean of the sampling distribution is going to be denoted with this x bar, that tells us the distribution of the means when the sample size is n.

所以抽样分布的总体均值将用这个 x 条表示，它告诉我们当样本量为 n 时均值的分布。

Assuming that the true proportions are equal, that the mean of the sampling distribution of this statistic is actually 0, what's the probability that we get a difference of 0.051?

假设真实比例相等，该统计数据的抽样分布均值为 0， 那么我们得到 0. 051 差值的概率是多少？

And this is a completely equivalent statement to saying that the mean of the sampling distribution of our low-fat diet minus the mean of the sampling distribution of our control should be equal to zero.

这完全等同于说我们的低脂饮食的抽样分布均值减去我们控制的抽样分布的均值应该等于零。

So the mean of the sampling distribution for this sample proportion, for the women, which is going to be the same thing as the mean of the population, which we already saw is going to be equal to P2.

所以这个样本比例的抽样分布的平均值，对于女性，这将与我们已经看到的人口平均值相同， 将等于 P2。