Credit scores
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
|