4.42. Seven different hardwood concentrations are being studied to determine their effect on the strength of the paper produced. However, the pilot plant can only produce three runs each day. As days may differ, the analyst uses the bal- anced incomplete block design that follows. Analyze the data from this experiment (use a = 0.05) and draw conclusions. Hardwood Concentration (%) Days 2 3 1 4 114 126 120 137 2 4 6 8 10 12 14 117 129 141 149 150 145 120 136 Hardwood Concentration (%) Days 6 5 7 120 117 119 134 2 4 6 8 10 12 14 143 118 123 130 127