Table 3.
Strength of experimental groups.
| Group | Sub-group | n | Mean Strength (MPa) | Standard deviation | % improvement |
|---|---|---|---|---|---|
| I | A | 10 | 33 | 2.25918 | 33 |
| A | 10 | 49 | 2.34434 | ||
| II | B | 10 | 21.25 | 2.79466 | 57 |
| B | 10 | 49.49 | 3.48038 |
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