Question: What's simple random sampling? Is it possible to sample data instances using a distribution different from the uniform distribution? If so, give an example of

  1. What's simple random sampling? Is it possible to sample data instances using a distribution different from the uniform distribution? If so, give an example of a probability distribution of the data instances that is different from uniform (i.e., equal probability).

  1. What's stratified sampling?

  1. What's "the curse of dimensionality"?

  1. Provide a brief description of what Principal Components Analysis (PCA) does. [Hint: See Appendix A and your lecture notes.] State what's the input and what the output of PCA is.

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