Abstract
This study was concerned with finding what characteristics of
data, such as direction of skewness, degree of skewness and
degree of kurtosis, affected students' ability to use histograms
and boxplots for detecting non-symmetry in the parent poplation.
The study found that while there was no consistent difference
between boxplots and histograms in the proportion of students
detecting non-symmetry in the parent popUlation, the direction of
skewness did have a significant effect, with more students
detecting skewness when the data was displayed in a left -skewed
orientation than when the same data was displayed in a right-skewed
orientation. This result is consistent with research
reported in the psychological literature where many, but not all,
studies have shown an over emphasis on the left hand field of
view for normal subjects. Other findings of the study are given
and suggestions for further research made.