## NPTEL Python For Data Science Week 4 Assignment Answers 2024

1. Which of the following are regression problems? Assume that appropriate data is given.

- Predicting the house price.
- Predicting whether it will rain or not on a given day.
- Predicting the maximum temperature on a given day.
- Predicting the sales of the ice-creams.

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2. Which of the followings are binary classification problems?

- Predicting whether a patient is diagnosed with cancer or not.
- Predicting whether a team will win a tournament or not.
- Predicting the price of a second-hand car.
- Classify web text into one of the following categories: Sports, Entertainment, or Technology.

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3. If a linear regression model achieves zero training error, can we say that all the data points lie on a hyperplane in the (d+1)-dimensional space? Here, d is the number of features.

- Yes
- No

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4. Which of the following machine learning techniques would NOT be appropriate to solve the problem given in the problem statement?

- kNN
- Random Forest
- Logistic Regression
- Linear regression

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5. After applying logistic regression, what is/are the correct observations from the resultant confusion matrix?

- True Positive = 29, True Negative = 94
- True Positive = 94, True Negative = 29
- False Positive = 5, True Negative = 94
- None of the above

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6. The logistic regression model built between the input and output variables is checked for its prediction accuracy of the test data. What is the accuracy range (in %) of the predictions made over test data?

- 60 – 79
- 90 – 95
- 30 – 59
- 80 – 89

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7. How are categorical variables preprocessed before model building?

- Standardization
- Dummy variables
- Correlation
- None of the above

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8. A multiple linear regression model is built on the Global Happiness Index dataset ‘GHI_Report.csv’. What is the RMSE of the baseline model?

- 2.00
- 0.50
- 1.06
- 0.75

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9. A regression model with the following function y=60+5.2x was built to understand the impact of humidity (x) on rainfall (y). The humidity this week is 30 more than the previous week. What is the predicted difference in rainfall?

- 156 mm
- 15.6 mm
- -156 mm
- None of the above

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10. X and Y are two variables that have a strong linear relationship. Which of the following statements are incorrect?

- There cannot be a negative relationship between the two variables.
- The relationship between the two variables is purely causal.
- One variable may or may not cause a change in the other variable.
- The variables can be positively or negatively correlated with each other.

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