2 new lubricant oils A and B and their effect on life of gears was tested....
2 new lubricant oils A and B and their effect on life of gears was tested.
| Lubricant | # Of Gears Tested | Mean life (In Days) | S |
| A | 10 | 5 | 2 |
| B | 12 | 6 | 1.5 |
Are they equally effective at significance level of 5%?
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2 new lubricant oils A and B and their effect on life of gears
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