Data science

Data science skills test: Pre-employment screening assessment to hire the best candidates

About the Data science test

Marc Andreessen’s famous declaration that “software is eating the world” has in more recent years been morphing into “data is eating the world” and with good reason. Data tracks user information and behavior and holds the clues to technological iteration and innovation. While it’s often said that the company with most data wins, it is in fact the company with the best-managed data that gleans the most valuable insights and comes out on top. And for that, you need a data scientist.

This test evaluates candidates’ knowledge on the fundamentals of data science and programming, and their skills in and theoretical understanding of statistics, machine learning, and neural networks and deep learning.

Candidates who do well on the test have a good grasp of fundamental and more advanced topics in data science. They can handle data well and work with large datasets to analyze scenarios and come to conclusions.

The test is made by a subject-matter expert

Vincent F.

Vincent has one mission: to share his expertise in data science and increase data literacy - a goal that’s evident in all of his endeavours. His greatest pleasure stems from teaching the fundamentals of data science in a way that’s accessible to all students.

Having worked for several years for companies big and small, Vincent is now taking his data science proficiency to the next level: he’s currently working on his Master’s thesis in machine learning and operations research.

Crafted with expert knowledge

TestGorilla’s tests are created by subject matter experts. We assess potential subject-matter experts based on their knowledge, ability, and reputation. Before being published, each test is peer-reviewed by another expert, then calibrated using hundreds of test takers with relevant experience in the subject. Our feedback mechanisms and unique algorithms allow our subject-matter experts to constantly improve their tests.

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The Data science test will be included in a PDF report along with the other tests from your assessment. You can easily download and share this report with colleagues and candidates.

data-science test

The benefits of recruiting with a data-science test

A data-science test is an important way to assess applicants’ core skills when it comes to data science. The candidate needs to be well-versed in topics such as:

machine learning
neural networks
deep learning

Our data-science test is designed to help you evaluate entry- to mid-level data scientists.

Data science aims to find algorithms (patterns) within a specific set of data. That’s why data scientists need to know their way around statistical techniques: they need to analyze the data, process it, and find insights.

Then, the data scientist uses this insight as a prediction model. It’s about determining what could happen in the future by using the insights gathered from the data. That’s why a data scientist’s job is so important. With these models, companies can make better, smarter, and more accurate business predictions for the future.

So having a really good data scientist is a matter of better preparing your organization for the future. That’s why you need to effectively evaluate your candidates – and a data-science test will help you to identify the top talent.
How you can use data science in the workplace

You can use data science in any number of fields inside your organization. The process will help your teams to run more efficiently. Here are some examples of how you can use data science in your company’s teams:

• Marketing: You can use data science in marketing for channel optimization, better lead targeting, real-time interaction with customers, maintaining customer loyalty, and predictive analysis.

• Sales: Data science can be used in sales for predicting sales, streamlining the sales process, improving lead generation, increasing results for cross-sells and upsells, improving the customer’s lifetime value, reducing churn rate with clients, and even setting the right price for your products and services.

• HR: In HR, you can use data science for employee sentiment analysis, reducing employee turnover, improving learning-and development initiatives, streamlining the hiring process, and implementing a better onboarding process.

There are some other applications of data science in the workplace, such as improving data and systems security, improving business intelligence, and carrying out complex data interpretations. Generally, it can help employees to make better decisions overall.

Data science competencies for candidates

Data scientists need to have certain competencies to do their job well. The skills that they should have are:

Knowledge of linear algebra
Understanding of mathematical principles such as dimensionality reduction and multivariable calculus
Coding and programming skills
Experience in Python
Knowledge of predictive modeling
Experience with data wrangling
Machine learning skills
Understanding of neural networks
Communication skills

The right data-science candidate

The right candidate will have all of the above-mentioned skills, but they will also have some underrated skills that are a bit harder to measure. They will have a pragmatic outlook that enables them to connect machine-learning models and data to find insights that are relevant for the business’s bottom line.

Not only that, but they will also need to work well with others to get the most out of data; creating business value from data science is a team effort and your data scientist will need to be able to work with others. They will also need to do things such as pair programming and sprint planning, which require them to be a team player.

And the last thing a data scientist needs is really good communication skills. All of the insights that are gathered from the data are in vain if their value isn’t being communicated to the correct stakeholders. So the right candidate will have a set of soft skills that makes them indispensable in the workplace.

data-science test
data-science test

What happens when a candidate lacks strong data-science skills

You need a good data scientist in your organization and you need to make sure that your hiring process is set up in a way that will enable you to find one. That’s why we recommend using a data-science test to evaluate your candidate.

If you hire the wrong candidate, you will create quite a lot of problems in your workplace. A not-so-good data scientist can:

Stop learning once they’re hired and miss out on new technological advances in the field that are crucial for doing the job successfully

Make mistakes when understanding the problem statement, which would create a faulty hypothesis

Be inexperienced with data verification, data cleaning, and data wrangling

Create models that don’t represent the data accurately

Create models that don’t provide the business with any meaningful value when it comes to the bottom line

Do a poor job when it comes to data security and leave openings that can turn into security breaches

All of these reasons and many more are why you need to properly vet your data-scientist candidates.

How can a data-science test help recruiters hire the right people?

The hiring manager should use a scientifically validated data-science test that will help to recruit a data scientist who’s qualified for the job.

Using a pre-employment test is the best way to screen candidates before identifying who you want to interview, because the test’s fair, objective results can be ranked to show you which applicants perform most strongly in the required skills..

This way, the candidates will be assessed only on their abilities, so you eliminate hiring bias and give every candidate the opportunity to prove themselves. And these pre-employment tests are simple, scalable and easy to use. Itt doesn’t make any difference to the hiring manager if there are 50 or 200 candidates: they simply distribute the same test with a single click.

In summary

Hiring an excellent data scientist is imperative because they can improve many processes in your marketing, HR, and sales teams. To ensure that you hire the right candidate, you should give them a pre-employment data-science test. With this, you will eliminate bias from the hiring process and assess your candidates only on their verifiable skills.


What is the difference between an assessment and a test?
An assessment is the total package of tests and custom questions that you put together to evaluate your candidates. Each individual test within an assessment is designed to test something specific, such as a job skill or language. An assessment can consist of up to 5 tests and 20 custom questions. You can have candidates respond to your custom questions in several ways, such as with a personalized video.
Can I add my own questions to an assessment?
Yes! Custom questions are great for testing candidates in your own unique way. We support the following question types: video, multiple-choice, coding, file upload, and essay. Besides adding your own custom questions, you can also create your own tests.
How do video questions work?
A video question is a specific type of custom question you can add to your assessment. Video questions let you create a question and have your candidates use their webcam to record a video response. This is an excellent way to see how a candidate would conduct themselves in a live interview, and is especially useful for sales and hospitality roles. Some good examples of things to ask for video questions would be "Why do you want to work for our company?" or "Try to sell me an item you have on your desk right now." You can learn more about video questions here.
Can you explain how the other custom question types work?
Besides video questions, you can also add the following types of custom questions: multiple-choice, coding, file upload, and essay. Multiple-choice lets your candidates choose from a list of answers that you provide, coding lets you create a coding problem for them to solve, file upload allows your candidates to upload a file that you request (such as a resume or portfolio), and essay allows an open-ended text response to your question. You can learn more about different custom question types here.
Can I customize an assessment with my company logo and color theme?
Yes! You can add your own logo and company color theme to your assessments. This is a great way to leave a positive and lasting brand impression on your candidates.
What type of support do you offer?
Our team is always here to help. After you sign up, we’ll reach out to guide you through the first steps of setting up your TestGorilla account. If you have any further questions, you can contact our support team via email, chat or call. We also offer detailed guides in our extensive Help & Inspiration Center.
What is the cost for using the Data science test?
You can find our pricing packages here. Sign up here to try TestGorilla today.
Can I combine the Data science test with other tests?
Yes. You can add up to five tests to each assessment.
Where in my recruitment process should I use the Data science test?
We recommend using our assessment software as a pre-screening tool at the beginning of your recruitment process. You can add a link to the assessment in your job post or directly invite candidates by email. TestGorilla replaces traditional CV screening with a much more reliable and efficient process, designed to find the most skilled candidates earlier and faster.

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