Efftronics Systems Data Analyst Interview Questions and Answers

Q1. Case Study related to Business and Supply Chain
Add your answer
Q2. Tableau, Python, SQL
Add your answer

It was aptitude and technical MCQ questions round

Q1. Technical interview- regarding skills mentioned in resume and projects
Add your answer
Q2. In same round hr interview was done
Add your answer

Q1. What metrics can be used to evaluate the performance of a regression model?
Ans. 
Various metrics like Mean Squared Error, R-squared, Mean Absolute Error can be used to evaluate regression model performance.
• Mean Squared Error (MSE) - measures the average of the squares of the errors or deviations

• R-squared (R2) - indicates the proportion of the variance in the dependent variable that is predictable from the independent variables

• Mean Absolute Error (MAE) - measures the average of the absolute errors b...read more
Answered by AI
Add your answer
Q2. What methods can be used to remove a specific type of noise from an image?
Ans. 
Methods like median filtering, Gaussian filtering, and wavelet denoising can be used to remove noise from an image.
• Median filtering replaces each pixel's value with the median value of its neighborhood.

• Gaussian filtering uses a weighted average of neighboring pixels to smooth out noise.

• Wavelet denoising decomposes the image into different frequency bands and removes noise from each band separately.
Answered by AI
Add your answer

Machine learning-based problem.

Round duration - 30. minutes
Round difficulty - Easy

It was in the evening, question were moderate

Q1. 
Count Subsequences Problem Statement
Given an integer array ARR of size N, your task is to find the total number of subsequences in which all elements are equal.
Explanation:
A subsequence of an array i...read more
Ans. 
Count the total number of subsequences in which all elements are equal in an integer array.
• Iterate through the array and count the frequency of each element.

• Calculate the total number of subsequences for each element using the formula (frequency * (frequency + 1) / 2).

• Sum up the total number of subsequences for all elements and return the result modulo 10^9 + 7.
Answered by AI
Add your answer

Round duration - 30 minutes
Round difficulty - Easy

It was in the night around 9:00 PM.

Q1. 
Pair Sum Problem Statement
You are given an integer array 'ARR' of size 'N' and an integer 'S'. Your task is to find and return a list of all pairs of elements where each sum of a pair equals 'S'.
Note:
...read more
Ans. 
Given an array and a target sum, find all pairs of elements that add up to the target sum.
• Iterate through the array and for each element, check if the complement (target sum - current element) exists in a hash set.

• If the complement exists, add the pair to the result list.

• Sort the pairs based on the first element and then the second element.

• Return the list of pairs as the final result.
Answered by AI
Add your answer

Q1. Salary expectation .
Add your answer
Q2. Why should I hire you?
Add your answer

Q1. Mendix Advanced questions.
Add your answer
Q2. Everything which you mentioned in your resume.
Add your answer