sample	obs1	obs2	obs3	obs4	mean	stdev
1	11.362	11.506	11.305	11.427	11.400	0.086
2	11.491	11.227	11.242	11.872	11.458	0.301
3	11.576	11.280	11.495	11.487	11.460	0.126
4	11.686	11.561	11.321	11.644	11.553	0.163
5	11.331	11.628	11.381	11.367	11.427	0.136
6	11.175	11.669	10.832	11.687	11.341	0.414
7	11.346	11.557	10.836	12.622	11.590	0.751
8	11.758	11.969	12.041	11.676	11.861	0.172
9	11.971	11.693	10.766	11.537	11.492	0.516
10	11.213	11.801	11.961	11.145	11.530	0.411
11	11.352	11.748	11.123	12.001	11.556	0.393
12	11.725	12.083	11.307	12.189	11.826	0.399
13	11.731	11.201	12.067	11.451	11.613	0.372
14	12.467	11.667	11.698	11.510	11.836	0.429
15	12.139	10.912	12.045	11.599	11.674	0.56
16	11.999	12.074	11.068	11.750	11.723	0.458
17	11.307	12.006	11.320	11.815	11.612	0.353
18	11.814	11.210	11.582	12.064	11.668	0.363
19	11.571	11.655	11.508	11.877	11.653	0.161
20	12.041	12.156	12.179	11.969	12.086	0.099