Fit a cubic polynomial to the following data:
x | 3 | 4 | 5 | 7 | 8 | 9 | 11 | 12 |
y | 1.6 | 3.6 | 4.4 | 3.4 | 2.2 | 2.8 | 3.8 | 4.6 |
Along with the coefficients, determine r2 and sy/x.
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