2026 Actual CompTIA DY0-001 Dumps, Updated Exam Questions for Guaranteed Pass

DY0-001 free sample questions and answers

CompTIA DY0-001 practice quiz with correct answers for search indexing.

1. Question 1

   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
   

   Correct 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.

   
   

2. Question 2

   A data scientist needs to:

   Build a predictive model that gives the likelihood that a car will get a flat tire.

   Provide a data set of cars that had flat tires and cars that did not.

   All the cars in the data set had sensors taking weekly measurements of tire pressure similar to the sensors that will be installed in the cars consumers drive. Which of the following is the most immediate data concern?

   AGranularity misalignment
   

   BMultivariate outliers
   

   CInsufficient domain expertise
   

   DLagged observations
   

   Correct answer: D

   Because tire-pressure sensors report only weekly measurements, you risk missing the critical pressure drop immediately preceding a flat. Those stale (''lagged'') readings may not reflect the condition just before failure, undermining your model's ability to learn the true precursors to a flat tire.

   
   

3. Question 3

   A data scientist needs to analyze a company's chemical businesses and is using the master database of the conglomerate company. Nothing in the data differentiates the data observations for the different businesses. Which of the following is the most efficient way to identify the chemical businesses' observations?

   AIngest the data from all of the hard drives and perform exploratory data analysis to identify which business is responsible for chemical operations.
   

   BPerform analysis on all of the data and create a summary report on the results relevant to chemical operations.
   

   CConsult with the business team to identify which sites are responsible for chemical operations and ingest only the relevant data for analysis.
   

   DIngest data from the hard drive containing the most data and present sample results on the chemical operations.
   

   Correct answer: C

   Engaging the business team leverages domain expertise to pinpoint which records pertain to chemical operations, allowing you to extract and analyze just the relevant subset. This avoids the time and resource waste of ingesting and sifting through unrelated data.

   
   

4. Question 4

   Given the following:

   

   Which of the following time series models best represents this process?

   AARIMA(1,1,1)
   

   BARMA(1,1)
   

   CSARIMA(1, 1, 1) x (1, 1, 1)1
   

   DAR(1)
   

   Correct answer: D

   The model has a single autoregressive term and only whitenoise errors, matching the definition of an AR(1) process.

   
   

5. Question 5

   A data scientist is working with a data set that has ten predictors and wants to use only the predictors that most influence the results. Which of the following models would be the best for the data scientist to use?

   AOLS
   

   BRidge
   

   CWeighted least squares
   

   DLASSO
   

   Correct answer: D

   LASSO regression uses an L1 penalty that drives lessimportant feature coefficients to exactly zero, effectively selecting only the predictors that most influence the outcome.