Question: show all work please! 5. (a) Explain the scree graph and describe how you will use it determining the number of principal components to be

show all work please!

5. (a) Explain the scree graph and describe how you will use it determining the number of principal components to be retained. (b) Data on x = sales and x2 = profits for the 10 largest companies in the world were listed in Exercise 1.4 of Chapter 1. From Example 4.12 155.60 7476.45 303.62 S 14.70 303.62 26.19 (a) Determine the sample principal components and their variances for these data. (You may need the quadratic formula to solve for the eigenvalues of S.) (b) Find the proportion of the total sample variance explained by r

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