Data Science Online Test

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About the test

The Data Science online test assesses the ability to use tools and techniques to analyze large sets of data, extract information, suggest conclusions, and support decision-making. 

The assessment includes work-sample tasks such as:

  • Applying a linear regression to a set of data.
  • Using Bayes' Theorem to determine the probability of an event.
  • Building machine learning models.

A good data scientist or data analyst needs to be able to extract knowledge and insights from data in order to support the decision-making process.

Sample public questions

5 min
Data Science

Two bacteria cultures, A and B, were set up in two different dishes, each covering 50% of its dish. Over 20 days, bacteria A's percentage of coverage increased to 70% and bacteria B's percentage of coverage reduced to 40%:

Petri Dish

5 min
Data Science
Confusion Matrix
Machine Learning

A classifier that predicts if an image contains only a cat, a dog, or a llama produced the following confusion matrix:

  True values    
Dog Cat Llama
Predicted values     Dog 14 2 1
Cat 2 12 3
Llama 5 2 19

What is the accuracy of the model, in percentages?

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Sample silver certificate

Sunshine Caprio

Java and SQL
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13 more premium Data Science questions

Billiard Club Occupancy, Cheating Indicator, Distribution of Answers, Hiring Process, Rain, Credit Wizard, Patient Classification, Subscribers, CTR, Bacterial Growth, Age and Earnings, Wine Quality, Bank Loan.

Skills and topics tested

  • Data Science
  • Linear Regression
  • Outliers
  • Bayes' Theorem
  • Probability
  • Probability Distributions
  • Classification
  • Decision Tree
  • Machine Learning
  • ROC
  • Decision Boundary
  • Poisson Distribution
  • Binomial Distribution
  • P-Value
  • Curve Fitting
  • Correlation
  • Multicollinearity

For job roles

  • Data Analyst
  • Data Scientist

Sample candidate report

What others say

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Simple, straight-forward technical testing

TestDome is simple, provides a reasonable (though not extensive) battery of tests to choose from, and doesn't take the candidate an inordinate amount of time. It also simulates working pressure with the time limits.

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