Research Article
The Dosage of Superplasticizer in Cemented Coal Waste Backfill Material Based on Response Surface Methodology
Table 5
Significant test of the regression coefficients.
| | Factor | Coefficient estimate | df | Standard error | 95% CI low | 95% CI high | VIF |
| | Intercept | 0.6490 | 1 | 0.0116 | 0.6239 | 0.6741 | | | A | −0.0259 | 1 | 0.0091 | −0.0455 | −0.0063 | 1.0000 | | B | −0.0131 | 1 | 0.0091 | −0.0327 | 0.0066 | 1.0000 | | C | −0.1593 | 1 | 0.0091 | −0.1789 | −0.1397 | 1.0000 | | BC | 0.0808 | 1 | 0.0119 | 0.0552 | 0.1064 | 1.0000 | | A2 | 0.0236 | 1 | 0.0088 | 0.0046 | 0.0426 | 1.01 | | C2 | 0.0304 | 1 | 0.0088 | 0.0114 | 0.0494 | 1.01 |
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