1 Rank these four classification models from the most flexible model to the least flexible model: KNN with K=1, KNN with K=2, LDA, QDA. Which one among these four models has the most bias with respect to bias-variance tradeoff concept?

2 In a certain classification problem, the number of predictors ???? is extremely large, and the number of observations ???? is small. Do you think LDA or QDA would perform better? Why?