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Table 8 Regression analysis of 7-day compressive strength.

From: Mass Concrete Placement of the Offshore Wind Turbine Foundation: A Statistical Approach to Optimize the Use of Fly Ash and Silica Fume

P-value (F test): 4.09E(-11)
Sample multiple coefficient of determination: R2 = 0.89
  y-intercept (βo) and the linear regression coefficients (β1, β2, β3) P-value 95% of confidence interval
y-intercept − 66.938 (MPa) 0.0003 (− 99.486; − 34.390)
Binder 0.330556 (MPa/kg/m3) 4.07E(−9) (0.256; 0.405)
FA + SF − 0.86 (MPa/%) 4.65E(−6) (− 1.159; − 0.561)
SF 1.454167 (MPa/%) 3.94E(−8) (1.080; 1.828)