A market research company is comparing two populations. The two independent samples drawn from the different populations. The first has a sample size of 72, a sample mean of 22.8 and a sample standard deviation of 4.7. The second has a sample size of 53, a sample mean of 22.2 and a sample standard deviation of 5.4. Assume that the two populations' standard deviations are not known and equal. Calculate and enter the amount of t-test statistic for testing H0: 1-2=0