Solve using inference with two populations: Pay attention to H(o) and H(a)

Suppose we want to test whether or not the average SAT score at school 1 is significantly larger than the average SAT score at school 2. Taking a random sample, we manage to get the following seven scores from school 2 students:

school 2: 1340 1500 1430 1440 1380 1470 1290 and the following nine scores from school 1 students: UR: 1540 1480 1390 1450 1440 1350 1520 1400 1600

Assuming that the standard deviation in SAT scores for students at school 1 and school 2 is the same and equal to 77 points, test at the =:05 significance level whether or not the average SAT score at school 1 is larger than the average SAT score at school 2.