# Data Science Online Test

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## For Jobseekers

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

## For Companies

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

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

Hard
20 min
num
Public
AI-resistant
Data Science
Classification
Decision Boundary

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.

Easy
20 min
fill
Public
AI-resistant
Data Science
Descriptive Statistic
Exploratory Data Analysis

Each day during 2019 an agency asked a hundred randomly selected people which party they would vote for if elections were held that day. Results of the poll were recorded in the following file. The Workers' Party asked for the report which they plan to use to improve their strategy for upcoming elections.

Fill in the missing values in the report for 2019:

• The arithmetic mean of votes for the Workers' Party is: __ (rounded to one decimal place)
• The median of votes for the Workers' party is: __ (rounded to closest integer)
• The standard deviation of votes for the Workers' party is: __ (rounded to one decimal place)
• The difference between the largest and the smallest number of votes for the Workers' party for March is: __
That maximum was achieved on 2019-__-__ by __.
• The party with the largest difference between the maximum and minimum number of votes is _______. That difference is __ votes.

## For jobseekers: get certified

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

## Sample silver certificate

Sunshine Caprio

Java and SQL
TestDome
Certificate

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### Skills and topics tested

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

### For job roles

• Data Analyst
• Data Scientist

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## 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

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