Q-Q图可以用于检验样本是否服从正态分布，在Excel里绘制Q-Q图步骤如下（参考How do you make Q-Q plot in Excel?）：
排序的数据集 A sorted data set
对数据点排序的序数序列 An ordinal sequence to rank the data points
对数据点执行分位数计算 Perform the quantile calculation over the data set points
查找与数据集的分位数相对应的z分数 Find the z-scores corresponding to the quantiles of the data set
This in an illustration of the above mentioned:
Then, you Insert a scatter plot, using the z-scores as the X axis and the data set points as the Y Axis
{Please notice: my Excel version is in Spanish, but the context is the same for all other language versions.}
After doing this, you will have a chart that resembles this
Right-click on the data points and select the add trend line option
Format the plot as desired