The following measurements x1 and x2 were made on a sample of four genuine ten pound notes. Genuine (A) X1 X2 6. 4 1 7 11 9 6 8 Similar measurements were made on a sample of five forged ten pound notes. (a) Show that the sample covariance matrix for group A is equal to (17.667 4.333 1.667) 4.333 to 3 decimal places.

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