# APLUSA Stats — Your market research data > Market research statistical analysis tools: confidence interval, percentage comparison, sample size. (iPhone/iPad app by A PLUS A SAS.) - Source: https://appshunter.io/ios/app/aplusa-stats/id411884947 (this page in markdown: same URL + `.md`) - Developer: [A PLUS A SAS](https://appshunter.io/developer/411884950) - Category: Business, Utilities - Price: Free - Rating: 5.00/5 from 2 App Store ratings · 6 written reviews indexed - Age rating: 4+ - Requires: iOS 13.0 · 19 MB - Languages: English - Released: 2010-12-29 - Data updated: 2026-08-06 - Monetization: free - User reviews in markdown: https://appshunter.io/ios/app/aplusa-stats/id411884947/reviews.md ## What is APLUSA Stats? 3 common statistical tools used to analyze market research results: 1 - CONFIDENCE INTERVAL CALCULATOR 2 - COMPARING TWO PERCENTAGES 3 - SAMPLE SIZE CALCULATOR ----------------------------------------- 1 - CONFIDENCE INTERVAL CALCULATOR Level of accuracy in percentages observed: To conduct market research is to interview (or observe) a sample of individuals. The larger the sample, the greater the statistical accuracy. Confidence interval provides the level of accuracy of a given measure. FOR INSTANCE Upon interviewing a sample of 500 GP’s, 20% are found to be using Product A. So, what is, within the total population, the actual proportion of users of Product A. Assuming 5% risk level*, confidence interval is: • 20% +/-3.5 • [16.5%-23.5%] In other words, there is a 95% probability that the actual percentage of Product A users in the total population of GPs is between 16.5% and 23.5%. ------------------------------------- 2 - COMPARING TWO PERCENTAGES Statistical significance between 2 observed percentages: When comparing opinions (or attitudes) measured on two samples, a significance test is applied. Significance tests provide an indication whether observed percentages are significantly different or not. FOR INSTANCE Upon interviewing a sample of 500 GP’s, 20% are found to be using Product A. Equally, upon interviewing a sample of 150 cardiologists, 25% of those are found to be using Product A. Would such a result suggest that a larger proportion of cardiologists is using Product A? At 5% risk level*, the two percentages observed on these samples are not statistically different. In other words, there is a 95% probability that the actual proportion of Product A users among GPs’ total population is similar to the actual proportion of Product A users among cardiologists’ total population. ------------------------------- 3 - SAMPLE SIZE CALCULATOR Minimum sample size calculations: By taking into account an expected percentage, as well as the corresponding confidence interval, it is possible to calculate the sample size needed for a given market research survey. This application calculates the minimum sample of respondents needed in order to achieve the required level of research accuracy. FOR INSTANCE Research is needed to evaluate the level of use of Product A among anaesthetists. The desired confidence interval is +/-8. Approximately one third of anaesthetists is expected to be using Product A. How many anaesthetists need to be interviewed in order to achieve this margin of error? At 5% risk level*, for an expected percentage of 33%, with a confidence interval of +/-8, minimum sample size is 133 anesthetists. In other words, if you interview a minimum of 133 anesthetists, there is a 95% chance to get a confidence interval of +/-8 if the proportion of Product A users in the anesthetist sample is 33%. ## Key features - Confidence Interval Calculator - Compare Two Percentages - Sample Size Calculator - Market Research Analysis - Statistical Accuracy Tools ## Recent user reviews (6 of 6) All indexed reviews: https://appshunter.io/ios/app/aplusa-stats/id411884947/reviews.md ### 5/5 — Very useful and user friendly *2018-10-12, version 2.0* Very good ### 5/5 — Stats *2018-10-12, version 2.0* Useful app easy to use! I recommend ### 5/5 — Very useful *2018-10-12, version 2.0* Very useful app with a beautiful design. ### 5/5 — Super Outils *2012-02-23, version 1.1* Genial, nouveau fan de statistique je voulais faire la même appli. ### 5/5 — A+A stats *2011-04-27, version 1.1* Good ### 5/5 — Simple and great *2011-01-18* It is a great stats tool, focusing on few aspects. Great for calculating confidence intervals, and chi-square test. ## Frequently asked questions about APLUSA Stats ### What statistical tools does APLUSA Stats offer? APLUSA Stats provides three common statistical tools for market research: a Confidence Interval Calculator, a tool for Comparing Two Percentages, and a Sample Size Calculator. ### How accurate is the data provided by APLUSA Stats? The app helps you understand the level of accuracy in percentages observed from your sample. For example, it can show you a 95% probability range for a given percentage within the total population. ### Can APLUSA Stats determine if two observed percentages are significantly different? Yes, the 'Comparing Two Percentages' tool applies a significance test to indicate whether observed percentages from different samples are statistically different or not, assuming a 5% risk level. ### How does APLUSA Stats help with survey planning? The Sample Size Calculator within APLUSA Stats calculates the minimum number of respondents needed for a market research survey to achieve a required level of research accuracy, given an expected percentage and confidence interval. ### What is the risk level used in APLUSA Stats calculations? The application consistently uses a 5% risk level for its calculations, meaning there is a 95% probability associated with the results provided by the calculators. ### Is APLUSA Stats available on multiple devices? Yes, APLUSA Stats is supported on iPhone, iPad, and iPod, making it accessible across various Apple devices. ### How often is APLUSA Stats updated? The app was last updated on October 19, 2025, indicating ongoing development and maintenance by the developer. ### Does APLUSA Stats have ads? No, APLUSA Stats is ad-free, allowing users to perform their market research analysis without interruptions. ## Version history (last 5 releases) ### 3.0.4 — 2026-07-27 Compliance with Age Classification Requirements ### 3.0.3 — 2026-06-25 - Use of English as the default language for non-French users ### 3.0.2 — 2025-10-19 “About” section: reinstated the charts from the previous version to make example interpretation easier. “Sample” page: replaced the placeholder text “CI” with “Confidence Interval” for improved clarity. Tablet layout – “Contact” page: improved display with a more compact arrangement of agencies and locations. Updated store screenshots to reflect the latest changes in the app. ### 3.0.1 — 2025-09-09 Interface modification Internationalization implementation Comparison fix ### 3.0.0 — 2025-09-04 Information updated relating to age classification ## Apps similar to APLUSA Stats | App | Rating | Price | Category | | --- | --- | --- | --- | | [Apparel Sourcing LA](https://appshunter.io/ios/app/apparel-sourcing-la/id6747800514) | — | Free | Business | | [Texcare France](https://appshunter.io/ios/app/texcare-france/id1463171354) | — | Free | Business | | [Tasko Pro](https://appshunter.io/ios/app/tasko-pro/id6755304749) | — | Free | Business | | [Campus Boulogne](https://appshunter.io/ios/app/campus-boulogne/id6742021038) | — | Free | Business | | [Hygen tech](https://appshunter.io/ios/app/hygen-tech/id6670164606) | — | Free | Business | | [VoiceLinQ Mobile](https://appshunter.io/ios/app/voicelinq-mobile/id6741826338) | — | Free | Business | ## Related topics [aplusa](https://appshunter.io/ios/topics/aplusa) · [aplusa stats](https://appshunter.io/ios/topics/aplusa-stats) --- *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 2026-08-06.*