The interquartile range is resistant to the effect of outliers.
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Q. 2When the histogram of a data set is closely approximated by a normal curve, the standard deviation and the interquartile range are very close to equal on average.
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Q. 3When using a 20 trimmed mean, the largest 10 and the smallest 10 of the observations are discarded for calculation purposes.
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Q. 4If there are no outliers a skeletal and modified boxplot can differ in the length of the box, but not in the whisker lengths.
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Q. 5By definition, an outlier is extreme if it is more than 3.0 iqr away from the closest quartile.
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Q. 6For any given data set, the median must be greater than or equal to the lower quartile, and less than or equal to the upper quartile.
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Q. 7The variance is the positive square root of the standard deviation.
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Q. 8One disadvantage of using the mean as a measure of center for a data set is that its value can be affected by the presence of even a single outlier in the data set.
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