/  Classification Model-quiz-1

This Quiz contains totally 10 Questions each carry 1 point for you.

1. The most widely used metrics and tools to assess a classification model are:

Confusion matrix
cost-sensitive accuracy
Area under the ROC curve
All of the above

### Wrong!

2. How do you handle missing or corrupted data in a dataset?

Drop missing rows or columns
Replace missing values with mean/median/mode
Assign a unique category to missing values
All of the above

### Wrong!

3. When performing regression or classification, which of the following is the correct way to preprocess the data?

Normalize the data → PCA → training
PCA → normalize PCA output → training
Normalize the data → PCA → normalize PCA output → training
None of the above

### Wrong!

4. Which of the following is a widely used and effective machine learning algorithm based on the idea of bagging?

Decision Tree
Regression
Classification
Random Forest

### Wrong!

5. Which of the following is a disadvantage of decision trees?

Factor analysis
Decision trees are robust to outliers
Decision trees are prone to be overfit
None of the above

### Wrong!

6. To find the minimum or the maximum of a function, we set the gradient to zero because:

The value of the gradient at extrema of a function is always zero
Depends on the type of problem
Both 1 and 2
None of the above

### Wrong!

7. What is the purpose of performing cross-validation?

To assess the predictive performance of the models
To judge how the trained model performs outside the sample on test data
Both 1 and 2
None of the above

### Wrong!

8. Which of the following is a good test dataset characteristic?

Large enough to yield meaningful results
representative of the dataset as a whole
Both 1 and 2
None of the above

### Wrong!

9. Why is second order differencing in time series needed?

To remove stationarity
To find the maxima or minima at the local point
Both 1 and 2
None of the above

### Wrong!

10. Which of the folllowing is an example of feature extraction?

Constructing bag of words vector from an email
Applying PCA projects to a large high-dimensional data
Removing stopwords in a sentence
All of the above

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Classification Models – Quiz1

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