DEPT OF M M261-Consider the sample data for plants A, B, C & D

Consider the sample data for plants A, B, C & D of the company below, which are tabulated in table 1. Test whether the four means are equal at the 5% level of significance. Perform a test that will compare all 4 means at once. We are not interested in pair-wise comparisons at this stage. Please show all the steps in your calculations.Table 1:A B C D333 328 320 333332 329 321 321320 323 322 329326 327 325 330328 330 326 328325 331 328 325323 332 329 333321 320 330 331334 324 331 327322 323 332320 334329330328331330