1. The Peaceful Valley School has two second-grade classes that each have 30 students in them. The teachers have decided to use two different methods of teaching decimal addition to the students, and then give both classes the same test to measure their learning. Based on the results below, is there a significant difference between the scores for Class A and Class B? Use a two-tailed test with = .05. (Use the 5 steps. Excel can be used for this question.)

Class A and Class B had the following scores (Each class has 30 students, the data just wraps within the cells.):

Class A	Class B
20	24	23	29
22	16	24	30
25	30	30	23
23	28	28	24
22	26	20	26
21	22	22	22
24	25	26	21
17	21	27	27
23	19	26	26
25	20	24	25
24	22	20	19
22	24	24	20
22	27	23	27
21	28	19	29
20	22	23	30