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An experiment was performed to compare the abrasive wear of two different coating materials on the cutting tools: • Coat
Posted: Wed May 11, 2022 8:01 pm
by answerhappygod
- An Experiment Was Performed To Compare The Abrasive Wear Of Two Different Coating Materials On The Cutting Tools Coat 1 (29.95 KiB) Viewed 29 times
An experiment was performed to compare the abrasive wear of two different coating materials on the cutting tools: • Coating material A: 11 picces were tested, which gave average wear of 85 units with a sample standard deviation of 4 units. • Coating material B: 10 pieces were tested, which gave average wear of 81 units with a sample standard deviation of 5 units. Assume the populations to be normal. 1) Can we conclude at the 0.05 level of significance that the population variances of material A and material B are different? 2) Can we conclude at the 0.05 level of significance that the abrasive wear of material A exceeds that of material B if the population variances of material A and B are equal?