Oxide | t | df | P-Value | Mean |
SiO2 | 14.25 | 4 | 0.000* | 51.00 |
Al2O3 | 8.709 | 4 | 0.001* | 30.00 |
Fe2O3 | 1.44 | 4 | 0.223 | 7.36 |
TiO2 | 4.17 | 4 | 0.014* | 2.14 |
Na2O | 1.67 | 4 | 0.17 | 0.35 |
K2O | 2.74 | 4 | 0.05* | 1.53 |
CaO | 4.61 | 4 | 0.001* | 0.24 |
MgO | 2.63 | 4 | 0.06 | 0.23 |
LOI | 4.71 | 4 | 0.009* | 7.09 |