Refer to Exercise 15.2.
a. What are the conditions under which it is appropriate to use the Friedman test in comparing the mean yields from the five irrigation methods?
b. Use the Friedman test to determine if there is significant evidence of a difference in the mean yields for the five irrigation methods.
c. Compare the conclusions obtained from the Friedman test to the conclusions ob­tained from the AOV F test.
d. Explain why the conclusions should be different (or the same).
In exercise

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Method of Irigation Farm Surfuce Trickle Center Poin Luter Subirrigation Fann Mean 597 248 636 382 591 348 366 649 258 512 321 423 406 400 608 380 391 434 492 468 457 406 466 502 559 469 464.3 423 461 504 580 449 464 550 526 469 550 4976 350 370 460 452 343 340 327 378 419 458 389.6 401.9 456.6 478.9 493.9 430.9 408.7 470.8 500.0 507.3 493.2 464.2 588 689 690 10 Method Mean 616.3 353.2