Twin Tech Data Scientist Interview Questions and Answers

Contained 3 coding question and 10 mcq on stats, ML and SQL, They asked to complete in 1hr to get shortlisted for next round. Then next round didn't happen

Q1. Related Python Questions on Data Science
Ans. Brush up your knowledge on pandas numpy scikitlearn
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Q1. What projects you have done walk through
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Q2. Explain self join
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Hackerrank statistics and dsa

Q1. Technical interview related to my projects and assignments
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Q2. Difference between supervised and unsupervised learning, k means clustering, knn, SQL joins
Ans. 
Supervised learning uses labeled data to train a model, while unsupervised learning uses unlabeled data. K-means clustering is a type of unsupervised learning algorithm. KNN is a supervised learning algorithm. SQL joins are used to combine data from multiple tables.
• Supervised learning uses labeled data to train a model, while unsupervised learning uses unlabeled data

• K-means clustering is a type of unsupervised learning...read more
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Coding problem with python and sql join queries

Hackerrank assignment with 2 coding and couple mullt-choice questions.

Talked to hiring manager about a system design related to computer vision.

Q1. Design a ML model to come up with filtering choices in the website.
Ans. 
Design a ML model for filtering choices on a website.
• Collect user data on preferences and behavior

• Use collaborative filtering or content-based filtering algorithms

• Implement a recommendation system to suggest choices based on user data

• Regularly update the model with new data for improved accuracy
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Q2. SQL question to process given tables
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Q1. SQL pivots , window functions, there was one question related to duplicates removal.
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Q2. Python Excel vlookups, pandas, numpy
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Q1. Machine learning topics
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Q1. Probability, statistics, aptitude questions
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Q1. Negotiations related to your package thats all
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