In manual computation

3. Corrosion fatigue in metals has been defined as the simultaneous action of cyclic stress and chemical attack on a metal structure. A widely used technique for minimizing corrosion fatigue damage in aluminum involves the application of a protective coating. A study conducted by the Department of Mechanical Engineering at Virgini Tech used 3 different levels of humidity. (Low, Medium. High) and 3 types of coating (Uncoated, Anodized, Conversion). The corrosion fatigues data express in thousands of cycles of failure were recorded as follows: Humidity Coating Low Medium High 361 469 314 522 1344 1216 Uncoated 466 937 244 739 1027 1097 1069 1357 262 134 1011 1011 114 1032 322 471 78 466 Anodized 1236 92 306 130 387 107 533 211 68 398 130 327 130 1482 252 874 586 524 Conversion 841 529 105 755 402 751 1595 754 847 573 846 529 Perform an analysis of variance with 0.05 level of significance to test for significant main and interaction effects. (Use first method)