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Vistara Interview Questions and Answers
Ques:- What is the purpose of feature engineering in data analysis
Right Answer:
The purpose of feature engineering in data analysis is to create, modify, or select variables (features) that improve the performance of machine learning models by making the data more relevant and informative for the analysis.
Ques:- What is data normalization and why is it important
Right Answer:
Data normalization is the process of organizing data in a database to reduce redundancy and improve data integrity. It involves structuring the data into tables and defining relationships between them. Normalization is important because it helps eliminate duplicate data, ensures data consistency, and makes it easier to maintain and update the database.
Ques:- What is a hypothesis and how do you test it
Right Answer:
A hypothesis is a specific, testable prediction about the relationship between two or more variables. To test a hypothesis, you can use the following steps:

1. **Formulate the Hypothesis**: Clearly define the null hypothesis (no effect or relationship) and the alternative hypothesis (there is an effect or relationship).
2. **Collect Data**: Gather relevant data through experiments, surveys, or observational studies.
3. **Analyze Data**: Use statistical methods to analyze the data and determine if there is enough evidence to reject the null hypothesis.
4. **Draw Conclusions**: Based on the analysis, conclude whether the hypothesis is supported or not, and report the findings.
Ques:- What is exploratory data analysis (EDA)
Right Answer:
Exploratory Data Analysis (EDA) is the process of analyzing and summarizing datasets to understand their main characteristics, often using visual methods. It helps identify patterns, trends, and anomalies in the data before applying formal modeling techniques.
Ques:- What is the difference between correlation and causation
Right Answer:
Correlation is a statistical measure that indicates the extent to which two variables fluctuate together, while causation implies that one variable directly affects or causes a change in another variable.
Ques:- What are the best tools for learning finance and stock markets?
Right Answer:
Some of the best tools for learning finance and stock markets include:

1. Online courses (e.g., Coursera, Udemy)
2. Financial news websites (e.g., Bloomberg, CNBC)
3. Stock market simulators (e.g., Investopedia Simulator, Wall Street Survivor)
4. Books on investing and finance (e.g., "The Intelligent Investor" by Benjamin Graham)
5. Financial podcasts and YouTube channels
6. Investment apps with educational resources (e.g., Robinhood, E*TRADE)
7. Webinars and workshops hosted by financial experts.
Ques:- What is LLP?
Right Answer:
LLP stands for Limited Liability Partnership. It is a business structure that combines elements of both partnerships and corporations, providing limited liability to its partners while allowing them to manage the business directly.
Ques:- What are the skills required for this profile?
Right Answer:
The skills required for a Customer Service Executive/Officer include strong communication skills, problem-solving abilities, empathy, patience, active listening, time management, and proficiency in using customer service software.
Ques:- Why are you the best person for this job?
Right Answer:
I believe I am the best person for this job because I have strong communication skills, a passion for helping customers, and a proven track record of resolving issues effectively. My ability to stay calm under pressure and my commitment to providing excellent service align well with the values of your company.
Ques:- WHAT IS MEANT BY 'ZERO VALUE'IN QUANTITY SURVEYING.
Right Answer:
In quantity surveying, 'zero value' refers to items or work that are included in a project but do not have a cost associated with them, often because they are not expected to incur any expenses or are accounted for in other ways.
Ques:- What are the types of risks you may encounter in a project?
Right Answer:
1. **Technical Risks** - Issues related to technology and technical feasibility.
2. **Financial Risks** - Budget overruns or funding shortages.
3. **Schedule Risks** - Delays in project timelines.
4. **Scope Risks** - Changes in project scope or requirements.
5. **Resource Risks** - Availability and allocation of resources.
6. **Quality Risks** - Failure to meet quality standards.
7. **Stakeholder Risks** - Conflicts or changes in stakeholder expectations.
8. **External Risks** - Factors outside the project’s control, like regulatory changes or market conditions.
Ques:- What is the significance of the cement paste in the concrete?
Right Answer:
Cement paste binds the aggregates together, fills voids, and provides strength and durability to the concrete.
Ques:- Do you understand milestones, interdependencies, Resource allocation?
Right Answer:
Yes, I understand milestones as key points in a project timeline that signify important achievements. Interdependencies refer to the relationships between tasks where one task relies on the completion of another. Resource allocation involves assigning available resources, such as time, budget, and personnel, to various tasks to ensure project success.
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