**GreyCampus: Data Science Foundation Program Exam Answers**: ✅✅✅ The goal of the project is to predict the probability of an employee being absent on the basis of various metrics (health issues, personal issues, whereabouts, workload).

For this project, we shall use Python to understand the key steps in the Data Science process such as data cleaning, data exploration, and data visualization. We shall then implement an appropriate Machine Learning algorithm and gain deeper insights into the given dataset.

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Course Name | Data Science Foundation Program |

Organization | GreyCampus |

Skill | Job Skill |

Level | Beginner |

Language | English |

Price | Free |

Certificate | Yes |

## GreyCampus – Data Science Foundation Program Answers

**1. Fill in the blanks with the correct option(s): Logistic regression is a ____________ regression technique that is used to model data having a ________ outcome**

- linear, numeric
- linear, binary
- nonlinear, numeric
- nonlinear, binary

**2. Which of the following is NOT a supervised learning?**

- PCA
- Decision Tree
- Linear Regression
- Naive Bayesian

**3. Which of the following is the method to find the best fit line for data in Linear Regression?**

- Least Square Error
- Maximum Likelihood
- Logarithmic Loss
- Both A and B

**4. Which of the following assumption in regression modelling impacts the trade-off between under-fitting and over-fitting the most?**

- The polynomial degree
- Whether we learn the weights by matrix inversion or gradient descent
- The use of a constant-term
- None of the above

**5. Which one of the following statements is true regarding residuals in regression analysis?**

- Mean of residuals is always zero
- Mean of residuals is always less than zero
- Mean of residuals is always greater than zero
- There is no such rule for residuals.

**6. Which of the one is true about Heteroskedasticity?**

- Linear Regression with varying error terms
- Linear Regression with constant error terms
- Linear Regression with zero error terms
- None of these

**7. To test linear relationship of y(dependent) and x(independent) continuous variables, which of the following plot best suited?**

- Scatter plot
- Bar chart
- Histograms
- None of these

**8. Which of the following is true about “Ridge” or “Lasso” regression methods in case of feature selection?**

- Ridge regression uses subset selection of features
- Lasso regression uses subset selection of features
- Both use subset selection of features
- None of above

**9. Which of the following options is true regarding “Regression” and “Correlation”? Note: y is the dependent variable and x is an independent variable.**

- The relationship is symmetric between x and y in both.
- The relationship is not symmetric between x and y in both.
- The relationship is not symmetric between x and y in case of correlation but in case of regression it is symmetric.
- The relationship is symmetric between x and y in case of correlation but in case of regression it is not symmetric.

**10. Which of the following methods does not have a closed form solution for its coefficients?**

- Ridge regression
- Lasso
- Both Ridge and Lasso
- None of both

**11. Which of the following step/assumption in regression modeling impacts the trade-off between under-fitting and over-fitting the most?**

- The polynomial degree
- Whether we learn the weights by matrix inversion or gradient descent
- The use of a constant-term
- None of the above

**12. Let’s say a “Linear regression” model perfectly fits the training data (train error is zero). Now, Which of the following statement is true?**

- You will always have test error zero
- You can not have test error zero
- None of the above
- Both A and B

**13. Which of the following indicates a fairly strong relationship between X and Y?**

- Correlation coefficient = 0.9
- The p-value for the null hypothesis Beta coefficient =0 is 0.0001
- The t-statistic for the null hypothesis Beta coefficient=0 is 30
- None of these

**14. Which of the following algorithm are not an example of an ensemble learning algorithm?**

- Random Forest
- Extra Trees
- Gradient Boosting
- Decision Trees

**15. Which of the following is/are true while applying bagging to regression trees? 1.We build the N regression with N bootstrap sample. 2.We take the average the of N regression tree. 3. Each tree has a high variance with low bias.**

- 1 and 2
- 2 and 3
- 1 and 3
- 1,2 and 3

**16. How to select best hyperparameters in tree based models?**

- Measure performance over training data
- Measure performance over validation data
- Both of these
- None of these

**17. What are tree based classifiers?**

- Classifiers which form a tree with each attribute at one level.
- Classifiers which perform series of condition checking with one attribute at a time.
- Both the options given above.
- None of the above

**18. How will you counter over-fitting in decision tree?**

- By pruning the longer rules
- By creating new rules
- Both By pruning the longer rules’ and ‘ By creating new rules’
- None of the option

**19. Which of the following sentence(s) is/are correct?**

- In pre-pruning a tree is ‘pruned’ by halting its construction early.
- A pruning set of class labeled tuples is used to estimate cost complexity.
- The best pruned tree is the one that minimizes the number of encoding bits.
- All of the above

**20. Which one of these is not a tree based learner?**

- CART
- ID3
- Bayesian Classifier
- Random Forest

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