iPhone app Quick Confidence Interval

In statistics, confidence intervals can be used to express the degree to which sample results are reliable.

Confidence intervals are often stated in terms of a percentage like 90% or 95%.
When the sample or population distribution is the Normal (bell-shaped) distribution, the confidence intervals can be represented as a number of standard deviations () above or below the sample mean ().

Moving the slider beneath the graph will vary the confidence intervals from 50% to 99%.
Additionally, you may choose the two-tailed confidence intervals or the one-tailed interval by tapping the button beneath the slider.

In this application, you may chose the standardized Normal distribution with =0.0 and =1.0 or some other values for mean and standard deviation.,

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