An experiment was performed to compare the abrasive wear of two different laminated materials

An experiment was performed to compare the abrasive wear of two different laminated materials. Eleven pieces of material 1 were tested by exposing each piece to a machine measuring wear. Nine pieces of material 2 were similarly tested. In each case, the depth of wear was observed. The samples of material 1 gave an average (coded) wear of 85 units with a sample standard deviation of 4, while the samples of material 2 gave an average of 81 and a sample standard deviation of 5. Use a 0.1 level of significance to test the ratio of two populations.