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AI Variant Interview Questions and Answers

Updated 20 Jan 2025

Q1. which are the technical tools that your use for analysis and presentation purpose ?

Ans.

I use tools like Python, SQL, Tableau for data analysis and visualization.

  • Python for data cleaning and analysis

  • SQL for querying databases

  • Tableau for creating interactive visualizations

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Q2. In microsoft excel , a numeric value can be treated as a text value if it precedes with what?

Ans.

A numeric value can be treated as a text value in Microsoft Excel if it precedes with an apostrophe.

  • Precede the numeric value with an apostrophe (') to treat it as text.

  • For example, entering '123 in a cell will display as text '123 instead of the numeric value 123.

  • This is useful when you want to display leading zeros in a number without Excel automatically removing them.

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Q3. How would you remove duplicates In mysql

Ans.

To remove duplicates in MySQL, you can use the DISTINCT keyword or the GROUP BY clause.

  • Use the DISTINCT keyword to select unique values from a single column.

  • Use the GROUP BY clause to select unique combinations of values from multiple columns.

  • You can also use the DELETE statement with a subquery to remove duplicate rows from a table.

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Q4. How to find last 3 records

Ans.

To find the last 3 records, sort the data in descending order and select the first 3 records.

  • Sort the data in descending order based on the relevant field

  • Select the first 3 records from the sorted data

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Q5. New languages what you know

Ans.

I am proficient in Python, SQL, and R for data analysis.

  • Proficient in Python for data cleaning and analysis

  • Strong in SQL for querying databases

  • Experienced in R for statistical analysis and visualization

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Q6. Q1. How would you find the longest common subsequence in a string? Ans: Its a standard DP problem.

Ans.

Finding the longest common subsequence in a string is a standard dynamic programming problem.

  • Use dynamic programming to build a 2D array to store the length of the longest common subsequence at each pair of indices.

  • Traverse the array to reconstruct the longest common subsequence.

  • Example: For strings 'ABCD' and 'ACD', the longest common subsequence is 'ACD'.

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Q7. what is central limit theorem

Ans.

Central Limit Theorem states that the sampling distribution of the sample mean approaches a normal distribution as the sample size increases.

  • The theorem states that regardless of the shape of the population distribution, the sampling distribution of the sample mean will be approximately normally distributed.

  • It is a fundamental concept in statistics and is used in hypothesis testing and confidence intervals.

  • For example, if you take multiple samples of a population and calculat...read more

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