Opal is collecting data on water levels in different parts of town. She notices that her sample data has a low-value outlier. Which statement must be true? O Removing the outlier will not change the spread of the graph of the data set. O Removing the outlier will not change the variance of the data set. O Removing the outlier will increase the variance of the data set. O Removing the outlier will decrease the spread of the graph of the data set.