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ML Knowledge

2 years ago

Precision and recall are two common metrics used to evaluate the performance of classification models. Can you explain what they measure and how they are calculated? Also, discuss some situations where these metrics may not be suitable for assessing model accuracy.

Data Scientist

EPAM Systems

Benchling

Broadcom

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2 years ago

Statistics

2 years ago

Given that you have a margin of error of 3 with a sample size of n, what is the number of samples required to obtain a margin of error of 0.3?

Data Scientist

EPAM Systems

TikTok

Palo Alto Networks

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2 years ago

Statistics

3 years ago

How probable is it to select one red ball and one blue ball consecutively without putting the first pick back in the container, when there are 4 red balls and 2 blue balls?

Data Scientist

EPAM Systems

Anaplan

HelloFresh

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3 years ago

Behavioral

3 years ago

Is there anything you would change to make EPAM Systems better?

Data Scientist

EPAM Systems

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3 years ago

Behavioral

3 years ago

Your most memorable project. Share it with me.

Data ScientistTechnical Program ManagerSoftware EngineerProduct Manager

EPAM Systems

Electronic Arts

Dropbox

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3 years ago

Behavioral

3 years ago

Which skills qualify you for the position?

Data ScientistData Science ManagerEngineering ManagerUX Designer

EPAM Systems

JP Morgan

ServiceNow

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3 years ago

SQL

3 years ago

What methods would you employ to optimize an underperforming SQL query?

Data Scientist

EPAM Systems

Twitch

Grafana Labs

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3 years ago

Statistics

3 years ago

Explain the steps you would take to assess the significance of the results and estimate the difference in campaign effectiveness using data from an A/B test.

Data Scientist

EPAM Systems

Blend

Zalando

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3 years ago

ML Knowledge

3 years ago

What is the principle behind k-means clustering, and does it locate the global optimum? Code up an implementation that takes an N*D matrix.

Data Scientist

EPAM Systems

Chime

Convoy

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3 years ago

Behavioral

3 years ago

Share with me a time when you disagreed with a team member.

Data ScientistData Engineering ManagerEngineering ManagerUX Designer

EPAM Systems

Dunzo

Adyen

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3 years ago

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^*All interview questions are submitted by recent EPAM Systems Data Scientist candidates, labelled and categorized by Prepfully, and then published after being verified by Data Scientists at EPAM Systems.

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