6. For the reading data in file read.dat, let x be the data in column 2 (TAAST1), and suppose it is desired to predict y,

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6. For the reading data in file read.dat, let x be the data in column 2 (TAAST1), and suppose it is desired to predict y, the data in column 8 (WWISST2). Speculate on whether there are situations where it would be beneficial to use x2 to predict y taking into account the value stored in column 3 (SBT1). Use the functions in this chapter to address this issue.

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