The compressive strength of concrete is being studied and fo

The compressive strength of concrete is being studied, and four different mixing techniques are being investigated. The following data have been collected. Test the hypothesis that mixing techniques affect the strength of the concrete. Use alpha = 0.05.

Solution

One-way ANOVA: strength versus factor

Source DF SS MS F P
factor 3 489740 163247 12.73 0.000
Error 12 153908 12826
Total 15 643648

S = 113.3 R-Sq = 76.09% R-Sq(adj) = 70.11%

as the p-value<0.05 hence we reject H0 and claim that mixing techniqe effects the strength