NielsenIQ Junior Data Analyst Interview Questions and Answers

Q1. Tell me about your Project
Ans. 
Developed a predictive model to forecast customer churn for a telecommunications company.
• Used machine learning algorithms such as logistic regression and random forest

• Performed data preprocessing and feature engineering to improve model accuracy

• Collaborated with business stakeholders to understand key factors influencing customer churn
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Q1. Personal information related questions and degree related with also details in medical device and pharmacovigilance
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Q1. Mostly medical device questions and pharmacovigilance
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Q2. Details about pharmacovigilance
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Q3. Details about medical device
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Q4. It was Abbott Diabetic Care, so question was like any brief idea about diabetes , types of diabetes
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Q1. What are the available data types in sql
Ans. 
The available data types in SQL include numeric, character, date/time, and boolean types.
• Numeric data types include integer, decimal, and floating-point types.

• Character data types include char, varchar, and text types.

• Date/time data types include date, time, datetime, and timestamp types.

• Boolean data type represents true or false values.
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Q2. What are the joins available in SQL
Ans. 
Joins are used to combine rows from two or more tables based on related columns.
• INNER JOIN: Returns records that have matching values in both tables.

• LEFT JOIN: Returns all records from the left table and the matched records from the right table.

• RIGHT JOIN: Returns all records from the right table and the matched records from the left table.

• FULL JOIN: Returns all records when there is a match in either left or right tab...read more
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Q3. What is Power bi
Ans. 
Power BI is a business analytics tool that provides interactive visualizations and business intelligence capabilities.
• Power BI is a Microsoft product used for data analysis and visualization.

• It allows users to connect to various data sources and create interactive reports and dashboards.

• Power BI offers a wide range of visualizations, such as charts, graphs, and maps, to present data in a meaningful way.

• Users can perfor...read more
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Q1. Tell me about ur projects
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Quantitative, Verbal , numerical etc

Basic Programming questions

Q1. Reversing of String using C
Ans. 
Reversing a string in C using pointers and arrays.
• Use a pointer to the beginning of the string and another pointer to the end of the string.

• Swap the characters at the two pointers and move them towards each other until they meet in the middle.

• Repeat the process until the entire string is reversed.
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Tell about yourself ..?

Q1. About the projects that I have done .Regarding Sql
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Basic Mathematics questions level at 10 class

Q1. Tell me about yourself!
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Q2. What are your strengths and weekness?
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Q3. How do you handle stress?
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Q4. Define oscillation?
Ans. 
Oscillation is a repetitive variation, typically in a wave-like pattern.
• Oscillation refers to the repetitive movement or fluctuation around a central point.

• It can be seen in various phenomena such as pendulum swings, sound waves, and electronic signals.

• The frequency, amplitude, and phase are important characteristics of oscillation.

• Oscillation can be described mathematically using trigonometric functions like sine and
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Good Questions and more technical contents

Asking basic coding concepts like python and java