Hi, i need help with this question.
In a study by Mino et. al. (2006), 50 workers in high-stress jobs were randomly split between a stress-management group and a control group.
After 3 months, the Center for Epidemiologic Study for Depression Scale showed that employees in the control group had a mean of 3.93 depression symptoms with variance of 2.69, while those in the treatment group had a mean of 3.10 and variance of 2.47. The research hypothesis was that those in the stress-management group would have fewer symptoms. What was the test statistic in this one-tailed t-test?
Does this mean that the difference between means = 3.93-2.69 or should it be the other way round (ie 2.69-3.93)
Also since this is a left tail test, does it mean the answer should be negative.
Last edited by Math085; 12-07-2010 at 04:10 PM. Reason: grammaticality error
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