# Quick Confidence Interval

> Statistical tool for visualizing and calculating confidence intervals. (iPhone/iPad app by MSYapps.)

- Source: https://appshunter.io/ios/app/quick-confidence-interval/id482317565 (this page in markdown: same URL + `.md`)
- Developer: [MSYapps](https://appshunter.io/developer/458482419)
- Category: Education, Utilities
- Price: $0.99
- Rating: 5.00/5 from 1 App Store ratings
- Age rating: 4+
- Requires: iOS 12.0 · 1 MB
- Languages: American English
- Released: 2011-12-01
- Data updated: 2026-07-10
- Monetization: paid
- User reviews in markdown: https://appshunter.io/ios/app/quick-confidence-interval/id482317565/reviews.md

## What is 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 (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.

## Key features

- Visualize confidence intervals
- Adjust confidence level (50%-99%)
- One-tailed or two-tailed intervals
- Customize mean and standard deviation
- Supports Normal distribution


## Frequently asked questions about Quick Confidence Interval

### What is Quick Confidence Interval used for?

Quick Confidence Interval is an educational tool designed to help users understand and visualize confidence intervals in statistics. It allows for the calculation and graphical representation of these intervals based on user-defined parameters.

### How does Quick Confidence Interval help with learning statistics?

The app aids learning by providing an interactive way to explore how changing the confidence level or distribution parameters affects the confidence interval. This visual feedback can deepen understanding of statistical concepts.

### Can I use Quick Confidence Interval offline?

As a paid application with no mention of online-only features, it is likely that Quick Confidence Interval can be used offline. This allows for convenient study and practice without requiring an internet connection.

### What devices does Quick Confidence Interval support?

Quick Confidence Interval is available for iPhone and iPod devices. It is designed to run on iOS operating systems.

### How often is Quick Confidence Interval updated?

The app was last updated on November 22, 2023, indicating ongoing support and potential for future improvements. The current version is 2.8.

### What is the price of Quick Confidence Interval?

Quick Confidence Interval is a paid application, available for a one-time purchase of $0.99. This price provides full access to all its features without recurring costs.

### What is the age rating for Quick Confidence Interval?

Quick Confidence Interval has an age rating of 4+, making it suitable for a wide range of users, including younger students learning basic statistical concepts.

### Does Quick Confidence Interval have ads?

No, Quick Confidence Interval does not contain advertisements. As a paid application, it offers an uninterrupted user experience focused on learning.

## Version history (last 5 releases)

### 2.8 — 2023-11-22

- Compiled with Xcode 15
- Minor GUI change

### 2.7 — 2020-10-21

- Changes necessitated by iOS 13 & 14
- Removed links to Facebook and Twitter
- Some GUI changes

### 2.6 — 2019-02-10

- Added audio cues on buttons.
- Compiled with Xcode 10.1.

### 2.5 — 2015-10-01

- Changes to accommodate iOS 9, mostly font modifications.

### 2.4 — 2015-07-07

- Changed the app icon.

## More apps by MSYapps

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- [Quick Correlation Coefficients](https://appshunter.io/ios/app/quick-correlation-coefficients/id478355922)

All apps by MSYapps: https://appshunter.io/developer/458482419

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*Data collected daily from the US App Store and indexed by [AppsHunter](https://appshunter.io/). User reviews are verbatim App Store reviews. Ratings, prices and chart positions refresh continuously; this snapshot is from 2026-07-10.*