Question 1 [100 marks] A medical research institute is working on a study to examine the relationship among two drugs, muscle weights, muscle types and muscle tension. Totally 299 mice are involved in this experiment. Table 1 gives the number of mice that have been injected drug A or drug B (variable 1), that have 2 15g or |z|) (Intercept) 0.8373 0.4658 1.798 0.072245 . b2 2.2846 0.4635 4.929 8.28e-07 *** d2 0.4682 0.3648 1.284 0.199284 a2 2.1604 0.4875 4.432 9.34e-06 *** c2 2.3301 0.4984 4.675 2.94e-06 *** b2:d2 ____________ 0.684 0.494173 b2:a2 -1.7870 0.4875 '3.666 0.000247 *** a2:c2 -2.8509 0.5934 -4.805 1.55e-06 *** b2:c2 -4.2T20 0.5456 -T.830 4.89e-15 *** d2:a2 -1.0717 0.3408 '3.145 0.001661 ** d2:c2 0.0596 0.4155 0.143 0.885937 b2:a2:c2 3.7041 0.6430 5.761 8.378-09 *** d2:a2:c2 1 0675 0 5198 2.054 0.040014 * Signif. codes: 0 '***' 0.001 '**' 0.01 '*' 0.05 '_' 0.1 ' ' 1 (Dispersion parameter for poisson family taken to be 1)