PhD Final Thesis April 2013.pdf - Anglia Ruskin Research Online

Thesis Keith Gale 2013Figure 9.8: Boxplot results for all participants for Section 3 of the questionnaireCommentary upon Figure 9.8:The boxplot in Figure 9.8 shows a vertical representation of the data. Length of thebox represents the spread of data between 25 th and 75 th percentiles. All four groupsexhibit the same spreads of data and median values of central tendency (representedby the horizontal lines). Vertical whiskers, which show the extent of largest andsmallest values (excluding outliers) are balanced for design and supplier groups. Thesupervision section group appears slightly negatively skewed whereas the othergroup is very positively skewed. There is one outlier and one extreme in the designgroup and an extreme in the supplier group.Although minor variances in the overall data scores are present between the groups,these represent marginal differences. All four groups are predominantly similar interms of spread of data with median values close to central tendency. The overallprofile for aggregation of the groups is accepted as within normal variances.214