A market research company is comparing two populations. The two independent samples drawn from the different populations. The first has a sample size of 69, a sample mean of 20.1 and a sample standard deviation of 7. The second has a sample size of 43, a sample mean of 19.3 and a sample standard deviation of 7.7. Assume that the two populations' standard deviations are not known and not equal. Calculate and enter the amount of t-test statistic for testing H0: 1-2=0