Workers in three different but comparable companies were asked to rate the use of quality-control techniques in their firms on a 50-point scale. A score of 50 represents nearly perfect implementation of quality control techniques and 0 represents no implementation. Workers are divided into three independent groups. One group worked in a company that had required all its workers to attend a 3-day seminar on quality control 1 year ago. A second group worked in a company in which each worker was part of a quality circle group that had been meeting at least once a month for a year. The third group of workers was employed by a company in which management had been actively involved in the quality-control process for more than a year. Use? = 0.10 to determine whether there is a significant difference between the three groups, as measured by the ratings.

Workers in three different but comparable companies we re asked to rate the use of quality-control techniques in their rms on a 50- point scale. A score of 50 represents nea rlv perfect implementation of quality control techniques and 0 represents no implementation. Workers are divided into three independent groups. l[line group worked in a company that had required all its workers to attend a 3- day seminar on qualityr control 1 year ago. A second group worked in a com pam,r in which each worker was pa rt of a quality circle group that had been meeting at least once a mo nth for a year. The third group of worke rs was employed by a com pa nv in which management had been actively involved in the qualitycontrol process for mo re than a vear. Use a = 0.10 to determine whether there is a signicant difference between the three groupsras measured by the ratings. Attended 3- Day Seminar 9 11 1? 10 3B 13 [Round the intermediate valua and nal answer to 2 decimal places. ea. 1.45.] Observed K= l The d ecisi on is to l 27 31 25 42 31 19 35 Quality Management Circles Involved '16 21 13 23 29 2D 22 Appendix A Statistical Tables