(b)
| Comparison | Std. error | S.E. difference | t value 5% | C difference |
|---|---|---|---|---|
| Treatment | 2.824504 | 3.994452 | 1.982127 | 7.917512 |
| Concentration | 3.261457 | 4.612396 | 1.982127 | 9.142356 |
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