Month (I) Month (J) Mean Difference (I-J) Std. Error Sig. 95% Confidence Interval
Lower Bound Upper Bound
October December 0.4899* 0.15384 0.011 0.0764 0.9033
February -0.2646 0.15384 0.530 -0.6781 0.1489
April 0.1879 0.15384 1.000 -0.2255 0.6014
December October -0.4899* 0.15384 0.011 -0.9033 -0.0764
February -0.7545* 0.15384 0.000 -1.1679 -0.3410
April -0.3019 0.15384 0.314 -0.7154 0.1115
February October 0.2646 0.15384 0.530 -0.1489 0.6781
December 0.7545* 0.15384 0.000 0.3410 1.1679
April 0.4525* 0.15384 0.024 0.0391 0.8660
April October -0.1879 0.15384 1.000 -0.6014 0.2255
December 0.3019 0.15384 0.314 -0.1115 0.7154
February -0.4525* 0.15384 0.024 -0.8660 -0.0391
*The mean difference is significant at the 0.05 level
Table 3: Bonferroni multiple comparison test of means chromium concentration due to month.