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Evidence of a difference between the variances in assembly

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 computerassisted,
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 which is attached.

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 teambased
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? Discuss.


Solution Summary

Your solution creates t-tests to study this in Excel. Results are discussed.