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The following is a set of coded experimental data on the compressive strength of a particular alloy at various values of the concentration of some

The following is a set of coded experimental data on the compressive strength of a particular alloy at various values of the concentration of some additive:

Concentration

Compressive strength

25.2

29.8

31.2

31.7

29.4

27.3

31.1

32.6

30.1

30.8

Estimate the regression equation in the form, Y = a + b1X + b2X2

The b1

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