Credit scores | English homework help

The table shows the credit scores for 12 randomly selected adults who are considered high-risk borrowers before and two years after they attend a personal finance seminar. At a = 0.01, is there enough evidence to support the claim that the seminar helps adults increase their credit scores? Assume the populations are normally distributed.

Adult

1

2

3

4

5

6

Credit score (before seminar)

608

620

610

650

640

680

Credit score (after seminar)

646

692

715

669

725

786

 

 

Adult

7

8

9

10

11

12

Credit score (before seminar)

655

602

644

656

632

664

Credit score (after seminar)

700

650

660

650

680

702