Question: A psychologist develops a training program designed to increase the performance of workers at a particular company. He gets performance data from 30 workers then

A psychologist develops a training program designed to increase the performance of workers at a particular company. He gets performance data from 30 workers then puts the workers through the training. Afterwards, he assesses the effectiveness of the training by gathering performance data again and testing his hypothesis at the .05 level. Is this a one-tailed or two-tailed test? If one-tailed, is the direction of the test left or right

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