Table 12.22 shows the result of an experiment to investigate the effect of vaccination of laboratory animals against a particular disease. Using the (a) 0.01 and (b) 0.05 significance levels, test the...

Table 12.22 shows the result of an experiment to investigate the effect of vaccination of laboratory animals against a particular disease. Using the (a) 0.01 and (b) 0.05 significance levels, test the hypothesis that there is no difference between the vaccinated and unvaccinated groups (i.e., that vaccination and this disease are independent).