elementary data analysis

QUESTION 3 An experiment was performed to compare the abrasive wear of two different laminated materials. Eleven pieces of material I 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 I 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