# StatDrill — Adaptive Stats Practice

> Adaptive Stats Practice (iPhone/iPad app by Long Nguyen.)

- Source: https://appshunter.io/ios/app/statdrill/id6790636035 (this page in markdown: same URL + `.md`)
- Developer: [Long Nguyen](https://appshunter.io/developer/6790294354)
- Category: Education, Reference
- Price: Free with in-app purchases
- Age rating: 4+
- Requires: iOS 17.0 · 1 MB
- Languages: American English
- Released: 2026-07-28
- Data updated: 2026-08-04
- User reviews in markdown: https://appshunter.io/ios/app/statdrill/id6790636035/reviews.md

## What is StatDrill?

StatDrill turns intro statistics into a habit, not a chore.

Instead of a fixed set of practice problems, every question in StatDrill is generated fresh from randomised numbers — so you can drill the same concept as many times as you need without ever memorising an answer key.

WHAT YOU'LL PRACTICE
• Descriptive statistics: mean, median, standard deviation, IQR, skew
• Probability basics: addition and multiplication rules, conditional probability, Bayes' theorem
• Probability distributions: binomial, normal, Poisson
• Sampling distributions and the Central Limit Theorem
• Confidence intervals (z and t)
• Hypothesis testing: z-tests, t-tests, p-values, Type I/II errors
• Two-sample tests: independent and paired
• Chi-square tests: goodness of fit and independence
• Simple linear regression
• Correlation

HOW IT WORKS
Pick a drill mode — Adaptive (focuses on your weak spots), Topic Focus, Cram, or Quick Five — and StatDrill builds a session for you. Every wrong answer comes with a worked explanation, not just a correct/incorrect stamp, so you actually learn why.

TRACK YOUR MASTERY
StatDrill tracks your accuracy and streak per topic, so you always know exactly where you stand before an exam.

FREE TO START
Descriptive Statistics and Probability Basics are free, with 5 questions a day. StatDrill Premium unlocks all 10 topics, unlimited daily questions, and every drill mode.

StatDrill is the practice companion to StatPilot — pull up StatPilot for a quick reference whenever a concept needs a refresher.

Terms of Use (EULA): https://www.apple.com/legal/internetservices/itunes/dev/stdeula/

## Pricing and in-app purchases

Base price: Free.

**Subscriptions**

| Subscription | Price | Period |
| --- | --- | --- |
| StatDrill Premium Monthly | $7.99 | per month |
| StatDrill Premium Yearly | $29.99 | per year |



## Version history (last 1 release)

### 1.0 — 2026-07-28

No release notes.

## More apps by Long Nguyen

- [BenchBrief](https://appshunter.io/ios/app/benchbrief/id6791914901)

All apps by Long Nguyen: https://appshunter.io/developer/6790294354

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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 2026-08-04.*