10.49 The director of training for a company that manufactures electronic equipment is interested ...

     10.49 The   director of training for a company that manufactures electronic equipment is   interested in determining whether different training methods have an effect   on the productivity of assembly-line employees. She randomly assigns 21 of   the 42 recently hired employees to a computer assisted, individual-based   training program. The other 21 are assigned to a team-based training program.   Upon completion of the training, the employees are evaluated on the time (in   seconds) it takes to assemble a part. The results are in the data file   Training.   a. Using a 0.05 level of   significance, is there evidence of a difference between the variances in   assembly times (in   seconds) of employees trained   in a computer-assisted, individual-based program and those trained in a team   based   program?   b. On the basis of the results   in (a), which t test defined in Section 10.1 should you use to compare the   means of the   two training programs?   

      Type 1 Type 0   19.4 22.4   16.7 13.8   20.7 18.7   19.3 18   21.8 19.3   16.8 20.8   14.1 15.6   17.7 17.1   16.1 18   19.8 28.2   16.8 21.7   19.3 20.8   14.7 30.7   16 24.7   16.5 23.7   17.7 17.4   16.2 23.2   17.4 20.1   16.4 12.3   16.8 15.2   18.5 16