... contain 10 80 poison.Time Control Impact Difference 1 0.40 0.37 -0 .032 0.37 0 .14 -0 .233 0.56 0.40 -0 .16 4 0.63 0.50 -0 .13 Start of Impact5 0.33 0.26 -0 .076 0.45 0.22 -0 .23Mean DifferenceBefore ... called a control-treatment paired (CTP) design (Skalski and Robson, 19 92, Chapter 6),or a before-after-control-impact-pairs (BACIP) design (Stewart-Oatenet al., 19 86). Sometimes information is ... Table 6.2, and plotted on Figure6.3. The mean difference (impact - control) for times 1 to 4 before theaerial drop is -0 .13 8. The mean difference after the drop for times 5 and 6 is -0 .15 0, which...