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20.08.2015
The confidence interval allows us to quantify how confident we can feel a group of data is from its mean value. For example, let's say we have a sample size of 32, with a mean of 33.4 and a standard deviation of 42.
A confidence of 50% will yield the shortest interval because it is the smallest and the least precise of all the confidence levels.


The confidence interval of 99.9% will yield the largest range of all the confidence intervals. Calculating the confidence interval for a given group can be useful for any science, including electronics. Since the sample size is small (below 30), we take the sample size and subtract 1 to get the degrees of freedom (df).


We calculate the lower estimate by the formula, lower estimate= mean - (standard deviation)(value of t?).



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