A biotech company is in the process of developing a new assay to measure vaccine immunogenicity in ferrets. From the ferrets randomly assigned the placebo the assay scores were observed to be: 108, 133, 134, 145, 152, 155, 169 and from the ferrets randomly assigned the vaccine the assay scores were observed to be: 115, 162, 162, 168, 170, 181, 199, 207. Determine the absolute value of the two-tailed student’s t critical values (rounded to the nearest hundredth) for testing whether MEAN IMMUNOGENICITY is associated with TREATMENT ASSIGNMENT (vax/placebo) at the 5% significance level.