In a boxplot, whiskers extending to data points within 1.5 IQR of the quartiles indicate what about the data?

• A. The range of non-outlier data; any outside points are plotted as outliers.
• B. The full data range includes all extreme values.
• C. Only the interquartile range is shown.
• D. The mean of the data is represented by the whiskers.

Answer: (A)

Whiskers in a boxplot represent the spread of data that are not outliers. They extend to the furthest data point that lies within 1.5 times the interquartile range (IQR) from the first and third quartiles. Any data points beyond that distance are shown separately as outliers. So this option correctly describes the whiskers as marking the range of non-outlier data, with outliers plotted outside.