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Table 9 Regression analysis of 28-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): 9.91E(−10)
Sample multiple coefficient of determination: R2 = 0.85
  y-intercept (βo) and the linear regression coefficients (β1, β2, β3) P-value 95% of confidence interval
y-intercept − 29.275 (MPa) 0.089 (− 63.368; 4.818)
Binder 0.275 (MPa/kg/m3) 2.19E(−7) (0.197; 0.353)
FA + SF − 0.93778 (MPa/%) 2.59E(−6) (− 1.251; − 0.624)
SF 1.231944 (MPa/%) 1.23E(−6) (0.840; 1.624)