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40 Linear Regression Interview Questions for Data Scientists

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This page lists down 40 regression (linear / univariate, multiple / multilinear / multivariate) interview questions  (in form of objective questions) which may prove helpful for Data Scientists / Machine Learning enthusiasts. Those appearing for interviews for machine learning / data scientist freshers / intern / beginners position would also find these questions very helpful and handy enough to quickly brush up / check your knowledge and prepare accordingly.

Practice Tests on Regression Analysis

These interview questions are split into four different practice tests with questions and answers which can be found on following page:

Regression Topics covered in these Practice Tests

Some of the following topics have been covered in these questions:

  • Introduction to linear (univariate) and multi-linear / multiple (multivariate) regression
  • Concepts related with coefficient of determination vis-a-vis pearson correlation coefficient
  • Evaluation of regression models using different techniques such as t-tests, analysis of variance f-tests
  • Sum of squares calculations and related concepts
  • Concepts related with R-squared, adjusted R-squared

Linear / Multi-linear Regression Questions and Answers

  1. In ________ regression, there is _______ dependent variable and ________ independent variable(s)
    • Simple linear, one, multiple
    • Multiple, multiple, one
    • Simple linear, one, one
    • Multiple, one, multiple
  2. In ________ regression, there is _______ dependent variable and ________ independent variable(s)
    • Simple linear, multiple, one
    • Simple linear, one, multiple
    • Multiple, one, multiple
    • Multiple, multiple, multiple
  3. It is OK to add independent variables to a multi-linear regression model as it increases the explained variance of the model and makes model more effcient
    • True
    • False
  4. Linear or multilinear regression helps in predicting _______
    • Continuous valued output
    • Discrete valued output
  5. Regression analysis helps in studying __________ relationship between variables.
    • Deterministic
    • Statistical
  6. Regression analysis helps in doing which of the following?
    • Causal analysis
    • Effects in forecasting
    • Forecasting trends
    • All of the above
  7. The best fit line is achieved by finding values of the parameters which minimizes the sum of __________
    • Prediction errors
    • Squared prediction errors
  8. Best fit line is also termed as _______
    • Maximum squares regression line
    • Least squares regression line
  9. Which of the following can be used to understand the statistical relationship between dependent and independent variables in linear regression?
    • Coefficient of determination
    • Correlation coefficient
    • Both of the above
    • None of the above
  10. It is absolutely OK to state that correlation does imply causation
    • True
    • False
  11. The value of coefficient of determination, R-squared, is _________
    • Less than 0
    • Greater than 1
    • Between 0 and 1
  12. Which of the following can be used to understand the positive or negative relationship between dependent and independent variables
    • Coefficient of determination
    • Pearson correlation coefficient
  13. The goal of the regression model is to achieve the R-squared value ________
    • Closer to 0
    • Closer to 1
    • More than 1
    • Less than 1
  14. Pearson correlation coefficient is __________ to coefficient of determination
    • Directly proportional
    • Inversely proportional
  15. Pearson correlation coefficient does always have positive value
    • True
    • False
  16. Value of Pearson correlation coefficient near to zero represents the fact there is a stronger relationship between dependent and independent variables
    • True
    • False
  17. Population correlation coefficient and sample correlation coefficient are one and the same
    • True
    • False
  18. The value of Pearson correlation coefficient falls in the range of _________
    • 0 and 1
    • 0 and -1
    • -1 and 1
    • 1 and 2
  19. The value of correlation coefficient and R-squared remains same for all samples of data
    • True
    • False
  20. The large value of R-squared can be safely interpreted as the fact that estimated regression line fits the data well.
    • True
    • False
  21. The value of R-squared does not depend upon the data points; Rather it only depends upon the value of parameters
    • True
    • False
  22. The value of correlation coefficient and coefficient of determination is used to study the strength of relationship in ________
    • Samples only
    • Both Samples and Population
    • Population only
  23. Which of the following tests can be used to determine whether a linear association exists between the dependent and independent variables in a simple linear regression model?
    • T-test
    • ANOVA F-test
    • Both of the abov
    • None of the abovee
  24. In order to estimate population parameter, the null hypothesis is that the population parameter is ________ to zero?
    • Equal
    • Not equal
  25. Which of the following can be used for learning the value of parameters for regression model for population and not just the samples?
    • Hypothesis testing
    • Confidence intervals
    • Both of the above
    • None of the above
  26. The value of R-Squared _________ with addition of every new independent variable?
    • May increase or decrease
    • Always increases
    • Always decreases
  27. In order to reject the null hypothesis while estimating population parameter, p-value has to be _______
    • More than 0.05
    • Less than 0.05
  28. The value of ____________ may increase or decrease based on whether a predictor variable enhances the model or not
    • R-squared
    • Adjusted R-squared
  29. The value of Adjusted R-squared _________ if the predictor variable enhances the model less than what is predicted by chance?
    • Increases
    • Decreases
  30. In regression model t-tests, the value of t-test statistics is equal to ___________?
    • Coefficient divided by Standard error of coefficient
    • Standard error of coefficient divided by coefficient
    • Coefficient plus standard error of coefficient
  31. In ANOVA test for regression, degrees of freedom (regression) is _________
    • Equal to number of parameters being estimated
    • One more than the number of parameters being estimated
    • One less than the number of parameters being estimated
  32. In ANOVA test for regression, degrees of freedom (regression) is _________
    • Equal to number of predictor variables
    • One more than the number of predictor variables
    • One less than the number of predictor variables
  33. For SST as sum of squares total, SSE as sum of squared errors and SSR as sum of squares regression, which of the following is correct?
    • SST = SSR – SSE
    • SST = SSR + SSE
    • SST = SSR/SSE
  34. The value of coefficient of determination is which of the following?
    • SSR / SST
    • SSE / SST
  35. Mean squared error can be calculated as _______
    • Sum of squares error / degrees of freedom
    • Sum of squares regression/ degrees of freedom
    • Sum of squares total/ degrees of freedom
  36. Sum of Squares Regression (SSR) is ________
    • Sum of Squares of predicted value minus average value of dependent variable
    • Sum of Squares of Actual value minus predicted value
    • Sum of Squares of Actual value minus average value of dependent variable
  37. Sum of Squares Error (SSE) is ________
    • Sum of Squares of predicted value minus average value of dependent variable
    • Sum of Squares of Actual value minus predicted value
    • Sum of Squares of Actual value minus average value of dependent variable
  38. Sum of Squares Total (SST) is ________
    • Sum of Squares of predicted value minus average value of dependent variable
    • Sum of Squares of Actual value minus predicted value
    • Sum of Squares of Actual value minus average value of dependent variable
  39. ______ the value of sum of squares regression (SSR), better the regression model
    • Greater
    • Lesser
  40. The objective for regression model is to minimize ______ and maximize ______
    • SSR, SSE
    • SSE, SSR
    • SSR, SST
    • SSE, SST

Hope you would find above set of questions along with practice tests related with linear / multiple rergression useful for next / upcoming interviews in relation with data scientist / machine learning engineer position.


Ajitesh Kumar

Ajitesh Kumar

Ajitesh has been recently working in the area of AI and machine learning. Currently, his research area includes Safe & Quality AI. In addition, he is also passionate about various different technologies including programming languages such as Java/JEE, Javascript and technologies such as Blockchain, mobile computing, cloud-native technologies, application security, cloud computing platforms, big data etc.

He has also authored the book, Building Web Apps with Spring 5 and Angular.
Ajitesh Kumar

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