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Degrees of freedom, value of the test statistic, null hypotheses

The daily production rates of a sample of sixteen workers in a factory before and after a training program (which was shown to be effective in other plants provided the following results: Use alpha equal to .01
Mean of the difference scores 5
Standard deviation of the difference scores =8
Is this problem, one tail, two tail upper tail, lower tail, a confidence interval, number of degrees of freedom ?
Value of the test statistic is?
one would reject or not reject the null hypotheses?