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

Thesis Keith Gale 20135% Trimmed Mean 75.8761Median 76.5000Variance 166.535Std. Deviation 12.90486OtherSkewness -1.119 .456Kurtosis 3.969 .887Mean 74.4545 2.7547195% Confidence Interval for MeanLowerBoundUpperBound68.316780.59245% Trimmed Mean 74.0606Median 73.0000Variance 83.473Std. Deviation 9.13634Skewness .816 .661Kurtosis -.281 1.279Commentary upon Table 9.7:Four independent variables are selected that represents four groups of participants –designers, supervisors, suppliers and others. The purpose of this is to assessnormality for each group and determine normality for the section. Output from Table9.7 indicates:• All four groups within 5% trimmed means with means very close in valueand few outlying scores.• Skewness values are negative for three groups (designers, supervisors,suppliers) indicating clustering of scores at the high value end whereas‘others’ produced a positive value.• Kurtosis values range from positive 11.697 to negative 0.281 giving a rangefrom high and peaked to relatively centred.• Mean and median values are similar for all groups but standard deviationvalues for ‘supplier’ and ‘designer’ groups are wider than ‘Others’. Standarddeviation values are polarised with two pairs of groups.209