Why is it best to compare medians and interquartile ranges for these data, rather than comparing means and standard deviations? a. some of these data have vastly different centers, and the median and interquartile range provide more reliable information in these circumstances. b. these data are fairly symmetric and do not have outliers, and the median and interquartile range provide more reliable information in these circumstances. c. some of these data have outliers and/or are skewed, and the median and interquartile range are resistant to outliers. d. some of these data have outliers and/or are skewed, and the median and interquartile range amplify the effects of outliers and skewness.