From the five-number summary for the Wick temperature data (see Quick exercise 16.6), it follows immediately that the height of the box is the IQR: 43 − 41 = 2. If we measure out a distance of 1.5...

From the five-number summary for the Wick temperature data (see Quick exercise 16.6), it follows immediately that the height of the box is the IQR: 43 − 41 = 2. If we measure out a distance of 1.5 times 2 down from the lower quartile 41, we see that the smallest observation within this range is 41, which means that the lower whisker has length zero. Similarly, the upper whisker has length zero. The two measurements with value 58 are outside the box and whiskers. The two values 58 are clearly far away from the bulk of the data and should be considered extreme outliers.