This is Dataplot data file NATR341.DAT Breaking Strength of Cement Briquettes: 5 Groups (Location Shift Example (with sigmas assumed equal) Question: Is breaking strength the same across all 5 groups? Source--Natella, Mary G. (1963). Experimental Statistics. National Bureau of Standards Handbook 91. U.S. Government Printing Office. Page 3-41 to 3-42. Number of observations = 5 x 5 = 25 Number of variables per line image = 2 Order of variables on a line image-- 1. Response Variable Y = Breaking Strength 2. Factor 1 = Group Id (1 to 5) To read this file into Dataplot-- SKIP 25 READ NATR341.DAT Y X ANOVA Y X Y X Breaking Strength Group ---------------------------- 518 1 560 1 538 1 510 1 544 1 508 2 574 2 528 2 534 2 538 2 554 3 598 3 579 3 538 3 544 3 555 4 567 4 550 4 535 4 540 4 536 5 492 5 528 5 572 5 506 5