Paytm Interview Questions, Process, and Tips for Experienced

SQL, ML, Python, Statistics

Q1. SQL, Statistics, Case Studies
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Q1. Business Case studies
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MySQL questions and Pandas Joins.

Q1. Explain Assumptions of linear regression?
Ans. 
Assumptions of linear regression include linearity, independence, homoscedasticity, and normality.
• Linearity: The relationship between the independent and dependent variables is linear.

• Independence: The residuals are independent of each other.

• Homoscedasticity: The variance of the residuals is constant across all levels of the independent variables.

• Normality: The residuals are normally distributed.

• Example: In a study exa...read more
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Q2. Joins using Pandas.
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Joins using Pandas involve merging two or more dataframes based on a common column or index.
• Use pd.merge() function to join dataframes based on a common column.

• Specify 'how' parameter to define the type of join (inner, outer, left, right).

• Use 'on' parameter to specify the column to join on.

• Example: pd.merge(df1, df2, how='inner', on='common_column')
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Q1. Write a query in the chatbox
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Write a query to find the total sales amount for each product in the past month.
• Use GROUP BY clause to group sales by product

• Use SUM function to calculate total sales amount

• Filter sales data for the past month using WHERE clause
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Q1. Why do you want to be PM
Ans. 
I am passionate about creating innovative products and leading cross-functional teams to success.
• Passion for creating innovative products

• Enjoy leading cross-functional teams

• Excited about the challenge of product management
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Q1. Basics of Linux
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Q2. Linux Booting process
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Linux booting process involves several stages including BIOS, bootloader, kernel loading, and initialization.
• BIOS (Basic Input/Output System) performs Power-On Self Test (POST) and locates the bootloader

• Bootloader (GRUB, LILO) loads the kernel into memory and initializes the system

• Kernel initializes hardware, mounts the root filesystem, and starts system services

• Init process (systemd, SysVinit) starts user-space proces
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Q3. Run level in linux
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Run levels in Linux are different operating modes that determine which services and processes are running.
• Run levels range from 0 to 6, with each level having a specific purpose.

• Run level 0 is for system halt, run level 1 is for single-user mode, run level 6 is for system reboot.

• Run level 3 is typically used for full multi-user mode with networking, run level 5 is for full multi-user mode with graphical interface.

• The d...read more
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Q4. Basic questions about linux
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Q1. Formal Discussion
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