HERE Technologies Data Specialist Interview Questions and Answers

Q1. Machine Learning-related stuff: Confusion Matrix, R2 score, etc.. Also, Python & Statistics.
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Q2. Explain any one project.
Ans. 
Developed a predictive model to forecast customer churn for a telecom company.
• Collected and cleaned customer data including usage patterns and demographics.

• Used machine learning algorithms such as logistic regression and random forest to build the model.

• Evaluated the model's performance using metrics like accuracy, precision, and recall.

• Provided actionable insights to the company based on the model's predictions.
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Q3. Difference between Data Analyst and Data Scientist.
Ans. 
Data Analyst focuses on analyzing data to provide insights, while Data Scientist focuses on using advanced algorithms and machine learning to predict future trends.
• Data Analyst focuses on analyzing data to provide insights for decision-making.

• Data Scientist focuses on using advanced algorithms and machine learning to predict future trends.

• Data Analyst typically works with structured data, while Data Scientist works wit...read more
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Round duration - 120 Minutes
Round difficulty - Medium

Q1. 
Ninja and His Secret Information Encoding Problem
Ninja, a new member of the FBI, has acquired some 'SECRET_INFORMATION' that he needs to share with his team. To ensure security against hackers, Ninja dec...read more
Ans. 
The task is to encode and decode 'SECRET_INFORMATION' for security purposes and determine if the transmission was successful.
• Read the number of test cases 'T'

• For each test case, encode the 'SECRET_INFORMATION' and then decode it

• Compare the decoded string with the original 'SECRET_INFORMATION'

• Print 'Transmission successful' if they match, else print 'Transmission failed'
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Round duration - 60 Minutes
Round difficulty - Medium

Q1. 
Equilibrium Index Problem Statement
Given an array Arr consisting of N integers, your task is to find the equilibrium index of the array.
An index is considered as an equilibrium index if the sum of elem...read more
Ans. 
Find the equilibrium index of an array where sum of elements on left equals sum on right.
• Iterate through the array and calculate prefix sum and suffix sum at each index.

• Compare prefix sum and suffix sum to find equilibrium index.

• Return the left-most equilibrium index or -1 if none found.
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Round duration - 50 Minutes
Round difficulty - Easy

Q1. How to transpose data set
Ans. 
Transposing a data set involves flipping rows and columns.
• Identify the data set to be transposed

• Create a new table with the columns and rows flipped

• Copy the data from the original table to the new table

• Transpose can be done using Excel, Python, R, SQL, etc.

• Example: Transposing a table of sales data to have products as rows and months as columns
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Q1. What is Structured Query Language?
Ans. 
Structured Query Language (SQL) is a programming language used to manage and manipulate relational databases.
• SQL is used to create, modify, and delete databases, tables, and data

• It is used to retrieve data from databases using queries

• SQL is used to perform operations on data such as sorting, filtering, and grouping

• Examples of SQL-based database management systems include MySQL, Oracle, and Microsoft SQL Server
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Simple aptitude and coding test, I was selected from national talent hunt exam

Q1. Discussion about projects and Areas of interest
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Q1. Basic questions like ok with location, shifts etc
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