# Quick Mean Difference

> Statistical tool for comparing means of two independent samples using Student's t-test. (iPhone/iPad app by Michael YOUNG.)

- Source: https://appshunter.io/ios/app/quick-mean-difference/id482964838 (this page in markdown: same URL + `.md`)
- Developer: [Michael YOUNG](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 12.4 · 2 MB
- Languages: English
- Released: 2011-12-01
- Data updated: 2026-06-25
- Monetization: paid
- User reviews in markdown: https://appshunter.io/ios/app/quick-mean-difference/id482964838/reviews.md

## What is Quick Mean Difference?

The mean difference is a measure of statistical dispersion between means of two independent samples.

This app tests the hypothesis that the means, μ, of two samples are equal at some level of probablility, p. The relevant statistic is the Student's t-test for the appropriate probability and degrees of freedom, df.

The critical value of the t-test for 5% probability at 30 degrees of freedom is shown as t(0.05, 30).

There are three assumptions imbedded in this test. First, the samples must be randomly generated. Second, the samples must be independently sampled meaning that the inclusion of one subject does not influence the probability of selecting any other member of the population. Third, the population variances, or standard deviations as input into this app, of the two samples, A and B, are presumed to be equal.

## Key features

- Calculates mean difference between two samples
- Performs Student's t-test
- Tests hypothesis of equal means
- Determines critical t-value
- Assumes equal population variances


## Frequently asked questions about Quick Mean Difference

### What is Quick Mean Difference used for?

Quick Mean Difference is used to test the hypothesis that the means of two independent samples are equal at a specified probability level. It calculates the relevant Student's t-test statistic.

### What are the assumptions for using Quick Mean Difference?

The app assumes that the samples are randomly generated, independently sampled, and that the population variances of the two samples are equal.

### What is the price of Quick Mean Difference?

Quick Mean Difference is a paid application, priced at $0.99.

### What devices does Quick Mean Difference support?

Quick Mean Difference is available for iPhone and iPod devices.

### How often is Quick Mean Difference updated?

The latest version, 3.0, was released on February 4, 2022. The app was originally released on December 1, 2011.

### What is the age rating for Quick Mean Difference?

Quick Mean Difference has an age rating of 4+, making it suitable for a wide range of users.

### Does Quick Mean Difference have ads?

No, Quick Mean Difference does not contain advertisements.

### What is the user sentiment for Quick Mean Difference?

Based on the available data, Quick Mean Difference has a perfect rating of 5.0 stars from 1 rating, indicating very positive user sentiment.

## Version history (last 5 releases)

### 3.0 — 2022-02-04

- Updated to accommodate newest iOS.
- Code simplifications and revisions.

### 2.5 — 2018-12-20

- Updated to account for latest iOS.

### 2.4 — 2015-10-01

- Changes to accommodate iOS 9, mostly font changes.

### 2.3 — 2015-06-29

- New icon design.
- GUI changes.
- Added Facebook and Twitter links.
- Updated to iOS 8.

### 2.2 — 2014-10-05

- Updated for iOS 8 and iPhone 6.
- Minor GUI tweaks.
- Updated graphing engine.

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## More apps by Michael YOUNG

- [Six Functions of a $1](https://appshunter.io/ios/app/six-functions-of-a-1/id458482416)
- [Quick Present Value](https://appshunter.io/ios/app/quick-present-value/id463739467)
- [Quick Internal Rate of Return (IRR)](https://appshunter.io/ios/app/quick-internal-rate-of-return-irr/id464400212)
- [Treasurys](https://appshunter.io/ios/app/treasurys/id468527873)
- [Quick Bootstrap Statistics](https://appshunter.io/ios/app/quick-bootstrap-statistics/id477641595)
- [Quick Correlation Coefficients](https://appshunter.io/ios/app/quick-correlation-coefficients/id478355922)

All apps by Michael YOUNG: 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 2026-06-25.*