(a  )For the numbers 12, 13, 15, 17, 20 Compute:  S = summation or zigma sign SX   SX2   (SX) 2  (B)  If 5 subjects were each tested 4 times, what is the sum of cross-products ΣWXYZ =                                                                       Subject      W     X      Y_   Z                               1             75      80    93   100                               2             80      66    88    34                               3             77      77    56    78                               4             65      90    46    87

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