What's New
- Changes necessitated by iOS 13 & 14
- Removed links to Facebook and Twitter
- Some GUI changes
App Description
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 (σ) above or below the sample mean (μ).
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 μ=0.0 and σ=1.0 or some other values for mean and standard deviation.
iPhone Screenshots
(click to enlarge)
App Changes
- June 14, 2014 Initial release
- October 06, 2014 New version 2.1
- November 13, 2014 Price increase: $0.99 -> $1.99
- January 08, 2015 New version 2.2
- June 29, 2015 New version 2.3
- July 07, 2015 New version 2.4
- October 05, 2015 New version 2.5
- June 14, 2019 New version 2.6
- November 12, 2020 New version 2.7
- November 12, 2020 Price decrease: $1.99 -> $0.99
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