BDx Data Centers Interview Questions and Answers for Freshers

Dashboards for Talent Aquations and HR Department

Q1. Personal questions and introductions
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Q2. Technical questions about MIS and Dashboards
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Q1. JAVA OOPS ,collections
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Q2. Explain SQL joins,order by difference between delete and truncate.
Ans. 
SQL joins combine data from two or more tables based on a related column. Order by sorts data in ascending or descending order. Delete removes rows from a table while truncate removes all rows.
• SQL joins are used to combine data from two or more tables based on a related column.

• Order by is used to sort data in ascending or descending order based on a specified column.

• Delete removes rows from a table based on a specified...read more
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Q3. Write program for palindrome.
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Program to check if a given array of strings are palindromes or not.
• Loop through each string in the array

• Reverse the string and compare it with the original string

• If they are equal, then it is a palindrome

• Store the result in a new array
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Q1. What is Linear Regression ?
Ans. 
Linear Regression is a statistical method to model the relationship between a dependent variable and one or more independent variables.
• It is used to predict a continuous outcome variable based on one or more predictor variables.

• It assumes a linear relationship between the dependent and independent variables.

• It is commonly used in fields like finance, economics, and social sciences.

• It can be simple linear regression (on...read more
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Q2. What is confusion matrix ?
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A confusion matrix is a table used to evaluate the performance of a classification model.
• It shows the number of true positives, false positives, true negatives, and false negatives.

• It helps in calculating various evaluation metrics like accuracy, precision, recall, and F1 score.

• It is useful in identifying the strengths and weaknesses of a model and improving its performance.

• Example: A confusion matrix for a binary clas...read more
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Q3. Explain Sampling , types of sampling , need of sampling
Ans. 
Sampling is the process of selecting a subset of data from a larger population for analysis.
• Types of sampling include random sampling, stratified sampling, cluster sampling, and systematic sampling.

• Sampling is necessary when it is not feasible or practical to analyze the entire population.

• Sampling can help reduce costs and time required for analysis.

• Sampling can also help reduce bias in the analysis by ensuring that th...read more
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