RailYatri Senior Data Analyst Interview Questions and Answers

Q1. Explain Moving Average
Ans. 
Moving Average is a statistical technique used to analyze data points by creating a series of averages of different subsets of the full data set.
• Moving Average helps in smoothing out fluctuations in data to identify trends over time.

• It is calculated by taking the average of a specific number of data points within a defined window.

• For example, a 3-day moving average for stock prices would be the average of the stock pri...read more
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Q2. Explain Decorators
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Decorators in Python are functions that modify the behavior of other functions.
• Decorators are denoted by the @ symbol followed by the decorator function name.

• They allow you to add functionality to an existing function without modifying its code.

• Common use cases include logging, timing, and authentication.

• Example: @decorator_function def function_to_decorate(): pass
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Q3. Explain Object Oriented Programming
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Object Oriented Programming is a programming paradigm based on the concept of objects, which can contain data and code.
• OOP focuses on creating objects that interact with each other to solve complex problems.

• Objects have attributes (data) and methods (functions) that can manipulate the data.

• Encapsulation, inheritance, and polymorphism are key principles of OOP.

• Example: In a car simulation program, a 'Car' object can hav...read more
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Q4. Explain classes objects
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Classes are blueprints for creating objects in object-oriented programming.
• Classes define the properties and behaviors of objects

• Objects are instances of classes

• Classes can inherit properties and behaviors from other classes

• Classes can have constructors to initialize objects

• Classes can have methods to perform actions
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Q5. Explain Functions
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Functions are blocks of code that perform a specific task and can be reused multiple times in a program.
• Functions help in organizing code and making it more modular.

• They can take input parameters and return output values.

• Functions can be called multiple times from different parts of the program.

• Examples: summing two numbers, finding the maximum value in a list.
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Q6. Pandas and Numpy
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Q7. Swap L1 and L5 in a list
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Swap L1 and L5 in a list
• Create a temporary variable to store the value of L1

• Assign the value of L5 to L1

• Assign the value of the temporary variable to L5
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Q1. Sql, advance Excel formulas
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I was asked with SQL querying questions.

Q1. Set of questions related to excel.
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Q2. Vlookup, sumifs, pivot tables
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Q1. Related to past work experience.
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Q2. Scenario based questions related to business industry.
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Q1. Tell me about yourself
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Q1. About the industry
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SQL, excel, tableau , looker studio

Q1. What is your notice period.
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Q1. Calculate no of rows after join
Ans. 
Calculate the number of rows after joining two datasets.
• Count the number of rows in each dataset

• Perform the join operation

• Count the number of rows in the resulting dataset
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Q2. Split person name in excel
Ans. 
Use Excel's text to columns feature to split person names into separate columns.
• Select the column containing the full names

• Go to the Data tab and click on Text to Columns

• Choose 'Delimited' and select the delimiter that separates the names (e.g. space)

• Click Finish to split the names into separate columns
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Q1. They will ask about your profile and past experience.
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Q1. A peer level colleague will ask some basic knowledge check questions
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This is literally a live coding test. For analytics expect SQL, python, R.

Q1. Interviewed by a manager of another team
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Q1. Interviewed by dotted line reporting manager
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Q1. Cross functional interview
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Q1. Core Values Interview
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SQL test on hackerrank