____ 11.1 The length of the whiskers is equal to 1.5 IQR, where IQR is the interquartile range.
____ 11.2 The length of the whiskers may be greater than 1.5 IQR, where IQR is the interquartile range.
____ 11.3 The length of the whiskers may be less than 1.5 IQR, where IQR is the interquartile range.
____ 11.4 The values at the ends of the whiskers are al- ways values in the data set used to construct the boxplot.