3(a). Consider the two-dimensional dataset of size 4 consisting of 21 = (+3,0) r2 = (-3,0) x3 = (0, +1) 24 = (0,-1). %3D %3D Show how we could use PCA to reduce this to a one-dimensional dataset. What would the dimension-reduced versions of r1, 12, 23, and r4 be?

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