Statistic Question

Consider the sample data for plants A, B, C & D of the above company, 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    D

333 328 320 333

332 329 321 321

320 323 322 329

326 327 325 330

328 330 326 328

325 331 328 325

323 332 329 333

321 320 330 331

334 324 331 327

322 323 332

320 334

329

330

328

331

330