Quick Mean Difference
$0.99
3.0for iPhone, iPod touch
Age Rating
Quick Mean Difference Screenshots
About 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.
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.
Show More
What's New in the Latest Version 3.0
Last updated on Feb 4, 2022
Old Versions
- Updated to accommodate newest iOS.
- Code simplifications and revisions.
- Code simplifications and revisions.
Show More
Version History
3.0
Feb 4, 2022
- Updated to accommodate newest iOS.
- Code simplifications and revisions.
- Code simplifications and revisions.
2.5
Dec 20, 2018
- Updated to account for latest iOS.
2.4
Oct 1, 2015
- Changes to accommodate iOS 9, mostly font changes.
2.3
Jun 29, 2015
- New icon design.
- GUI changes.
- Added Facebook and Twitter links.
- Updated to iOS 8.
- GUI changes.
- Added Facebook and Twitter links.
- Updated to iOS 8.
2.2
Oct 5, 2014
- Updated for iOS 8 and iPhone 6.
- Minor GUI tweaks.
- Updated graphing engine.
- Minor GUI tweaks.
- Updated graphing engine.
2.1
Oct 8, 2013
- Some minor GUI modifications and new logo.
2.0
Sep 24, 2013
- Major rewrite and redesign for iOS 7.
- Bug fixes.
- Bug fixes.
1.3
Nov 30, 2012
- Expanded screens to accommodate size of iPhone 5.
1.2
Sep 30, 2012
- Fixed bug in data entry routine.
- Improved precision from single to double.
- Modified syntax of iTunes App Store link.
- Improved precision from single to double.
- Modified syntax of iTunes App Store link.
1.1
Jan 6, 2012
- Tweaked GUI for improved data entry
1.0
Dec 1, 2011
Quick Mean Difference FAQ
Click here to learn how to download Quick Mean Difference in restricted country or region.
Check the following list to see the minimum requirements of Quick Mean Difference.
iPhone
Requires iOS 12.4 or later.
iPod touch
Requires iOS 12.4 or later.
Quick Mean Difference supports English
