Example
17.3.1-----Confidence intervel for mean
s1={5.1 4.9 4.7 4.6 5.0 5.4 4.6
5.0 4.4 4.9 5.4 4.8 4.8 4.3 5.8
5.7
5.4 5.1 5.7 5.1
5.4 5.1 4.6 5.1 4.8 5.0 5.0
5.2 5.2 4.7 4.8 5.4 5.2
5.5 4.9 5.0 5.5
4.9 4.4 5.1 5.0 4.5 4.4 5.0
5.1 4.8 5.1 4.6 5.3 5.0};