What are the advantages of version control?

Define “Time Series Analysis”

What do you mean by bagging and boosting? What is the key difference in the classifiers involved?

How important is the accuracy on training data vs testing data?

Does k-means converge to a global solution? If yes, can you give the intuition? If not, are there strategies we can use to get better clusters using k-means?

Discuss how to randomly select a sample from a product user population.

What is the bias-variance trade-off?

How do you detect if an observation is an outlier?

Can you explain the Naive Bayes Fundamentals? How did you set the threshold?

What are the different regularization metrics L1 and L2?

. Which of the following systems record changes to a file over time ? Record Control B. Version Control C. Forecast Control D. None of the mentioned

Which of the following approach should be used to ask Data Analysis question ? Find only one solution for particular problem B. Find out the question which is to be answered C. Find out answer from dataset without asking question D. ...

Which of the following is good way of performing experiments in data science ? Measure variability B. Generalize to the problem C. Have Replication D. All of the Mentioned

Describe efficient ways to merge a given k sorted arrays of size n each.  

The autocomplete feature: How would you implement it and can you highlight the flaws in this tool today?

In your experience as a business analyst, what is the most important aspect of analytical reporting?

In your experience as a business analyst, what is the most important aspect of analytical reporting?

ecommerce sector: the metrics to look for and the funnel analysis.

ecommerce sector: the metrics to look for and the funnel analysis.

Can you describe a time when you had to steer a client toward a different course of action than the one they were set on taking?

A client has a Christmas-themed e-commerce shop that sells five items. What are some potential problems you foresee with their revenue streams?

How would you deal with the situation when a customer starts taking your market share.

What is business modelling?

What do you understand by requirement? Can you differentiate between requirements and needs?

What is BRD? How is it different from SRS?

Can you explain SRS and its key elements?

Explain UML and its uses?

What is difference between joins and union?

How to Find out the Constraint Information in SQL?

What are different system queries needs to know for Business Analyst?

What is database Normalization? Tell me with its advantages.

What is database Normalization? Tell me with its advantages.

What is SQL and How it is beneficial for Business Analyst?

Company XYZ is an online video streaming company, just like YouTube or Dailymotion.   The Head of Product has identified as a major problem for the site a very high home page drop-off rate. That is, users come to the home-page and ...

What’s an adequate rebalance of an imbalanced dataset?

If there was a feature that 100% of the users used, would it be a good feature?

What features would you add to a model that don’t already exist?

Implement an iterator function which takes three iterators as the input and sorts them.

Describe how a random forest works under the hood.

What are the limitations to linear regression?

Given a long array that you can’t store, how do you find the median?

Let’s say you can play a coin flipping guessing game either once or a 2 out of 3 game. What is the best strategy for winning?

How does boosting work?

Let’s say that you work at a bank that wants to build a model to detect fraud on the platform. The bank wants to implement a text messaging service in addition that will text customers when the model detects a fraudulent ...

Write a function to generate an output which lists the pairs of friends with their corresponding timestamps of the friendship beginning and then the timestamp of the friendship ending.

There are two lists of dictionaries representing friendship beginnings and endings: friends_added and friends_removed. Each dictionary contains the user_ids and created_at time of the friendship beginning /ending .

Write a function to generate N samples from a normal distribution and plot the histogram.

We have a table called `song_plays` that tracks each time a user plays a song.Let's say we want to create an aggregate table called `lifetime_plays` that records the song count by date for each user.Write a SQL query that could make this ETL each ...

Let's say we have a table with an id and name field. The table holds over 100 million rows and we want to sample a random row in the table without throttling the database.Write a query to randomly sample a row from this table.

What is the ROC curve and the meaning of sensitivity, specificity, confusion matrix?