3. Unsupervised Learning
Pca — Quiz
Test your understanding of pca with 5 practice questions.
Practice Questions
Question 1
Which mathematical technique is fundamentally used by PCA to transform data?
Question 2
When performing PCA, what does the 'scree plot' help in determining?
Question 3
If the first principal component explains 70% of the variance and the second explains 20%, what is the cumulative explained variance by these two components?
Question 4
What is the primary purpose of 'data centering' (subtracting the mean) before applying PCA?
Question 5
Which of the following scenarios would most benefit from applying PCA?