The U.S. Department of Veterans Affairs mandates two day classes on sexual

harassment for new employees. As a potential cost reduction, the personnel office is

considering switching to an online course. There is concern that performance will be

lower with the computer, self-paced based training.

The Department conducts a trial with new employees where a random group are

assigned the online system. After either the online (6 subjects) or in-class training (8

subjects), employees are assessed two weeks after training with a standardized test

concerning knowledge of sexual harassment regulations and behavior with scores

ranging 0-100 (100 is the best score).

Data is as follows:

In-class: 70, 70, 60, 60, 65, 55, 65, 80

On-line: 75, 65, 80, 90, 70, 75

• Provide the null and alternative hypotheses in formal and plain language for appropriate two-tailed test (viz., dependent or independent) at the 0.05 significance level
• Do the math and reject/accept null at a=.05. State your critical t value.
• Explain the results in plain language.
• Calculate the 95% confidence interval for the difference in means and state both formally and in plain language if appropriate.