CompTIA DY0-001 Exam Practice Questions to Pass CompTIA DataAI Exam

Question 1

A data scientist is building a proof of concept for a commercialized machine-learning model. Which of the following is the best starting point?

ALiterature review

BModel performance evaluation

CHyperparameter tuning

DModel selection

Answer : A

Before diving into selecting or tuning models, a literature review grounds the proof of concept in existing research and best practices, ensuring the approach aligns with state-of-the-art methods and the problem's domain requirements.

Question 2

A data analyst wants to save a newly analyzed data set to a local storage option. The data set must meet the following requirements:

Which of the following file types is the best to use?

AJSON

BParquet

CXML

DCSV

Answer : B

Parquet is a columnar storage format that automatically includes schema (data types), uses efficient compression to minimize file size, and enables very fast reads for analytic workloads.

Question 3

Which of the following is best solved with graph theory?

AOptical character recognition

BTraveling salesman

CFraud detection

DOne-armed bandit

Answer : B

The traveling-salesman problem is a prototypical graph theory challenge, finding the shortest tour through a graph's nodes, whereas the other tasks rely on different domains (OCR on image processing, fraud detection often on statistical/anomaly methods, bandit problems on sequential decision theory).

Question 4

Which of the following types of machine learning is a GPU most commonly used for?

ADeep learning/neural networks

BClustering

CNatural language processing

DTree-based

Answer : A

GPUs excel at the massive parallelism required for the matrix and tensor operations at the heart of deep neural network training and inference, making them the go-to hardware for deep learning workloads.

Question 5

A data analyst wants to generate the most data using tables from a database. Which of the following is the best way to accomplish this objective?

AINNER JOIN

BLEFT OUTER JOIN

CRIGHT OUTER JOIN

DFULL OUTER JOIN

Answer : D

A full outer join returns every row from both tables, matched where possible and unmatched rows filled with NULLs, yielding at least as many (and typically more) rows than any other join type.

Question 6

A data scientist built several models that perform about the same but vary in the number of features. Which of the following models should the data scientist recommend for production according to Occam's razor?

AThe model with the fewest features and highest performance

BThe model with the fewest features and the lowest performance

CThe model with the most features and the lowest performance

DThe model with the most features and the highest performance

Answer : A

According to Occam's razor, when models perform equivalently, you choose the simplest one - in this case, the model that achieves the needed performance with the fewest features.

Question 7

A data scientist observes findings that indicate that as electrical grids in a country become more and more connected over time, the frequency of brownouts and blackouts in total decrease, and the frequency of major brownouts and blackouts increase. Which of the following distribution metrics could best be identified?

AScale axis magnitudes

BKurtosis

CSkewness

DNormality

Answer : B

Kurtosis quantifies how heavy or light the tails of a distribution are. In this case, fewer overall events but more extreme (major) brownouts/blackouts indicates heavier tails over time. This is exactly what an increasing kurtosis would reveal.

CompTIA DataAI Certification Exam DY0-001 Practice Questions