Comcast India Engineering Center Data Scientist Interview Questions and Answers

Q1. Python, alogrithms, data science
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Python 45 mins, OOPS Concepts, SQL

Q1. What is p value
Ans. 
P value is a statistical measure that helps determine the significance of results in hypothesis testing.
• P value is the probability of obtaining results as extreme as the observed results, assuming the null hypothesis is true.

• A small p value (typically ≤ 0.05) indicates strong evidence against the null hypothesis, leading to its rejection.

• Conversely, a large p value (> 0.05) suggests weak evidence against the null hypot...read more
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Q2. When will you use t test
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T test is used to determine if there is a significant difference between the means of two groups.
• Use t test when comparing means of two groups to determine if there is a significant difference.

• Commonly used in hypothesis testing to assess if there is a statistically significant difference between groups.

• Example: Comparing the average test scores of students who received tutoring versus those who did not.

• Example: Testin...read more
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How will you do customer segmentation

Q1. Tools you worked on previously
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I have worked with tools such as Python, R, SQL, Tableau, and Excel for data analysis and visualization.
• Python

• R

• SQL

• Tableau

• Excel
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Q2. Why did you choose cisco
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I chose Cisco for its reputation as a leader in networking technology and its commitment to innovation.
• Cisco is a global leader in networking technology

• Cisco has a strong reputation for innovation and cutting-edge solutions

• I admire Cisco's commitment to diversity and inclusion in the workplace
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2 coding questions - one on binary tree and list operations.

Q1. Xgboost explanation
Ans. 
Xgboost is a popular machine learning algorithm known for its speed and performance in handling large datasets.
• Xgboost stands for eXtreme Gradient Boosting, which is an implementation of gradient boosted decision trees.

• It is widely used in Kaggle competitions and other machine learning tasks due to its efficiency and accuracy.

• Xgboost is known for its ability to handle missing data, regularization techniques, and parall...read more
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Q2. Data structures question compulsory
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Based on topological sort

Q1. Ml baiscs like LR, SVM
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Q1. Ml design questions were asked
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Q1. Why do you want to join
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Q1. Why you are interested in working for clipchamp at Microsoft/
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Q2. How your career goals align with this role?
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Q1. Your past experience related questions
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Q1. Role related questions
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Q1. Why Microsoft? What products do you use?
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Q1. Discussion on projects written in resume and related problems. Some stats
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