The following information was obtained from two independent samples selected from two normally distributed populations with unknown but equal variances.
|
Sample 1
|
14
|
15
|
11
|
14
|
10
|
8
|
13
|
10
|
12
|
16
|
15
|
|
|
|
Sample 2
|
17
|
16
|
21
|
12
|
20
|
18
|
16
|
14
|
21
|
20
|
13
|
20
|
13
|
Test at the 2% signi?cance level whether μ1 is lower than μ2.