# DY0-001 Data & AI Exam Prep — ML Statistics & Practice Tests

> ML Statistics & Practice Tests (iPhone/iPad app by Davy Raitt.)

- Source: https://appshunter.io/ios/app/dy0-001-data-and-ai-exam-prep/id6761720033 (this page in markdown: same URL + `.md`)
- Developer: [Davy Raitt](https://appshunter.io/developer/1795318281)
- Category: Education, Productivity
- Price: Free with in-app purchases
- Age rating: 4+
- Requires: iOS 15.0 · 27 MB
- Languages: American English
- Released: 2026-04-07
- Data updated: 2026-10-14

## What is DY0?

PASS YOUR COMPTIA DATAAI EXAM
Master data science and AI concepts with 500+ practice questions designed to get you certified on your first attempt.
500+ practice questions
5-minute study sessions
Track your progress
Remove mastered questions
Text-to-speech support
Dark mode available

WHY GET CERTIFIED?
Data and AI professionals earn up to $203K annually (Skillsoft 2024). CompTIA DataAI validates your ability to work across the full data science and machine learning pipeline, making you a standout candidate for roles in analytics, AI engineering, and data strategy.

WHAT YOU'LL MASTER:
• Linear algebra foundations including matrix operations, transposition, and multiplication
• Eigenvalues and eigenvectors for understanding data transformations and system behavior
• Singular Value Decomposition (SVD) for matrix factorization and noise reduction
• PCA and dimensionality reduction techniques for high-dimensional datasets
• Probability distributions including normal, binomial, Poisson, and uniform
• Bayes' Theorem with prior, posterior, and likelihood calculations
• Descriptive and inferential statistics including hypothesis testing and confidence intervals
• Supervised learning with regression, classification trees, and ensemble methods
• Unsupervised learning including k-means clustering and hierarchical approaches
• Regularization techniques with L1 (Lasso) and L2 (Ridge) penalty methods
• MLOps and deployment pipelines including model versioning, monitoring, and CI/CD
• Model evaluation metrics including precision, recall, F1 score, AUC-ROC, and RMSE
• Data governance and compliance frameworks covering privacy, ethics, and regulatory standards
• Specialized data science applications in NLP, computer vision, and time series forecasting
• Business outcomes alignment connecting model performance to ROI and stakeholder objectives

STUDY ANYWHERE:
Coffee breaks. Commutes. Lunch hours. Turn dead time into data and AI expertise.
Download now. Pass your exam. Master data science.

## Pricing and in-app purchases

Base price: Free.

**Subscriptions**

| Subscription | Price | Period |
| --- | --- | --- |
| Pro Monthly | $3.99 | per month |
| Pro Yearly | $14.99 | per year |

**One-time purchases**

| Purchase | Price | Type |
| --- | --- | --- |
| Pro Lifetime | $19.99 | one-time |


## Is DY0 safe?

Not enough ratings yet to assess DY0.

## Is DY0 legit?

DY0-001 Data & AI Exam Prep appears legitimate, with a few gaps. The AppsHunter Legitimacy Score for DY0 is 65 out of 100 points across 7 verification signals from App Store and developer data.


## Version history (last 3 releases)

### 5.0.0 — 2026-09-11

Bug fixes and performance improvements

### 3.0.0 — 2026-04-17

New: Review missed questions after each quiz. Improved quiz experience with radio buttons for single-answer questions. Added exit button during quizzes. Better score display. Stability improvements.

### 1.0.0 — 2026-04-07

No release notes.

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All apps by Davy Raitt: https://appshunter.io/developer/1795318281

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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 2026-10-14.*