For each of the three datasets (data1.txt, data2.txt, and data3.txt in bnhw2q2.zip), cluster the data using k-means in Matlab, with k=2, 3, 4 and 5 using the provided Matlab script (hw2.m). For each data set:
a. Pick the most suitable k and discuss your choice.
b. Do you think all the points are in the "correct" cluster? Thoroughly explain why you think so. Discuss if k-means is appropriate for these data.