Data statistical significance with confidence factor
With a supplied set of data say...
0.2 1.4 3.2 2.2 6.4 3.1 9.2 5.3 3.3 2.9 etc
How can I calculate the statistical significance of this data and show the confidence level in %, and also if I wish it to be defined i.e. I want 95% confidence, how do I get it to inform me of the number of samples required to achieve this level?