Data Science Interview Question & Answers for Fresher’s and Experienced Candidates

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Train Yourself with the Best Data Science Interview Question Answers 

Data Science Interview Questions and Answers

The list on Data Science Question and Answers consist of all type of interview questions and answers, which are specially designed for all the Data Science Fresher’s and for all the experienced candidates. This question and answer set can be very much beneficial for Data Science new bees. Below is the given list of commonly asked Data Science interview questions and answers which are specially designed for each one at 3RI Technologies. 

We trust and anticipate that these set of Question and Answers related to Data Science will be highly beneficial for you and your career and help you reach new heights in the IT industry. These sets of questions and answers are specially designed by our Data Science Professional experts for freshers as well as for experienced candidates. These are one of the frequently asked questions in the top MNC’s of the IT industry. Apart from this, if you wish to pursue a Data Science course in Pune’s most reliable Data Science Training Institute, you can always drop by at 3RI Technologies. 

Now let us dive into the article below and check out the set of Data Science questions & Answers.

Q1. What do you mean by precision and recall in Data Science?

Ans: In Data science, precision is nothing but the percentage of all the correct predictions made by you. Whereas, recall is the exact percentage of all the predictions which are in point of fact true. 

Q2. What is the meaning of the word Data Science? 

Ans: From large volumes of data which is unstructured or structured, Data Science is nothing but the knowledge of extraction for it. In sort Data Science is the continuance of the data mining field and the predictive analysis. In other and simple words, it is commonly known as knowledge discovery and data mining.

Q3. What does the value of P of the statistics in data Science mean?

Ans: The P value is commonly used for determining the value of the end result, following a hypothesis test in statistics. The P value helps a reader to wrap up which is normally between 0 and 1.

  • P- Value> 0.05 indicates frail confirmation against a zero hypothesis, which strongly means that the null hypothesis can’t be rejected.
  • P-value <= 0.05 indicates sturdy substantiation alongside the zero hypotheses, that means that the null hypothesis can be rejected.
  • P-value = 0.05 is a boundary and a limited value which indicates that it is likely probable to go in both the directions.

Q4. Can one provide any kind of statistical method which can turn out to be very useful for all the data analysts?

Ans: The statistical methods which are commonly used by all the data analysts are listed below:

  • Mark’s process
  • Sort statistics, percentages, detection of outliers.
  • Bayes method
  • Imputation
  • Spatial and grape processes.
  • Symbolic algorithm
  • Mathematical optimization.

Q5. What do you mean by “Clustering”? List down all the properties of the Clustering algorithms in the answer below.

Ans: Clustering is nothing but a simple procedure where the all the data can be classified into one or more groups. Here are the following clustering algorithm properties which are listed below:

  • Iteratively
  • Hard and soft
  • Disjunctive
  • Hierarchical or straight.

Q6. List down some of the statistical methods which can be useful for all the data analysts?

Ans: Some of the simple and effective statistical methods which can be useful for all the data scientists are:

  • Sort statistics, percentiles, find out
  • Bayes method
  • Mathematical optimization.
  • Symbolic algorithm
  • Spatial and grape processes.
  • Mark’s process
  • Imputation techniques, etc.

Q7. Which are few of the common shortcomings of the linear model in Data Science?

Ans: Some of the vital disadvantages of using the linear model are:

  • The hypothesis of the linearity can consist of lot of errors in it.
  • It cannot be used for calculating the binary results or normal results.
  • There are too many huge number problems which cannot be effortlessly solved.

Q8. Name some of the common problems which are encountered by all the data analysts today?

Ans: Some of the most common problems which are encountered by all the data analysts in today’s world are:

  • Extremely bad pronunciation.
  • Replication of entries
  • Values that are missed
  • Values that are illegal 
  • Values that are differently presented.
  • Identification of overlapping data

Q9. Which are some of the common data verification methods that are used by all the data analysts?

Ans: Normally, some of the common methods that used by the data analysts to validate the data are:

  • Data verification
  • data verification

Q10.  Mention below all the various and the different steps in an analysis project.

Ans: The various steps used  in an analysis project include the following,

  • Definition of the problem
  • Data preparation
  • Data exploration
  • Data validation.
  • Modeling
  • Implementation and Monitoring

Q11. List of some best tools that can be useful for data-analysis?


  • OpenRefine
  • Tableau
  • Solver
  • Wolfram Alpha’s
  • NodeXL
  • Google Fusion Tables
  • Google Search Operators
  • RapidMiner
  • Io

Q12. Mention below the 7 common ways which are used in statistics by data scientists?


  • Create models that anticipate the signal, not noise.
  • Design and interpret experiments to inform about product decisions.
  • Remember user behavior, commitment, conversion, and potential customers.
  • Convert large data to a large image
  • Estimate intelligently.
  • Give your users what they want.
  • Tell a story with data.

Q13. Which kind of bias can be occurred during stamping? 


  • Survival of bias
  • Choice of bias
  • Low bias

Q14. Which are some of the significant and various methods for recovery of data commonly used by the data scientists?

Ans: Here are the 2 common methods that are used for verifying the data for data analysis and recovery:

  • Data Screening
  • Data verification

Q15. What do you mean by the imputation process? What are some of the common types of imputation techniques?

Ans: An imputation process is a process that involves and replaces the missing data elements with all its replacement values. There are two major kinds of imputation processes with subtypes which are listed below:

  • The role of a hot mallet.
  • Unique imputation.
  • Average allocation
  • Impact with a cold roof.
  • Stochastic regression
  • More imputation
  • Imputation regression.

Q16: What is the command for storing the R objects in a file?

Ans: Save (x, file = “x.Rdata”)

Q17. Which are some of the best ways for using Hadoop and R together for data analysis purpose?

Ans: In both the cases of Hadoop and R, they are very much complimented in provision to analyzing large amounts of data and for viewing. Altogether, there are nearly 4 different ways of using Big data Hadoop and R together. 

Q18. How can you access the element in columns 2 and 4 of the matrix with the name M?


  • In the Indexing method, you can effectively access the elements of the matrix by using the square.
  • While in the row and column method, you can access the elements as var. 

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