# Data Science Online Test

## For Jobseekers

Practice your skills and earn a certificate of achievement when you score in the top 25%.

Take a Practice Test## For Companies

Test candidates with real-world problems and interview the best ones.

Sign Up to Offer this Test## 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

The following .csv file contains the data from a classifier model that predicts if an image contains a dog: predictions.csv

The first column contains information if the dog is in the image or not. The second column contains the classifier prediction, which is in the interval 0-100, with higher values meaning that the classifier is more confident that image contains a dog.

What is the value of the decision boundary that will maximize the accuracy of the model? Values greater than or equal to the decision boundary will be treated as positive.

Your company is running a test that is designed to compare two different versions of the company’s website.

Version A of the website is shown to 60% of users, while version B of the website is shown to the remaining 40%. The test shows that 8% of users who are presented with version A sign up for the company’s services, as compared to 4% of users who are presented with version B.

If a user signs up for the company’s services, what is the probability that she/he was presented with version A of the website?

## For jobseekers: get certified

Earn a free certificate by achieving top 25% on the Data Science test with public questions.

Take a Certification Test## Sample silver certificate

Sunshine Caprio

Java and SQL TestDomeCertificate

## For companies: premium questions

Buy TestDome to access premium questions that can't be practiced.

Get money back if you find any premium question answered online.

### 13 more premium Data Science questions

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

### Skills and topics tested

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

### For job roles

- Data Analyst
- Data Scientist

### Sample candidate report

## What others say

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.

Jan Opperman, Grindrod Bank

### Product reviews

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