The following data from Example 10.4a give the scores obtained when four different reading tests were given to each of five students. Use it to estimate the parameters of the model.

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Student Examination 1 2 3 4 5 Row Totals Xi 75 2 3 78 80 4 73 3786 60 70 86 364 72.8 71 64 72 90 375 75 69 62 70 85 366 63 80 92 375 Column totals 306 280 249 292 353 1480 73.2 75 grand total 1480 xj 76.5 70 62.25 73 88.25 x = = 74 20