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A company is interested in knowing the effects of a computer-training program. The company randomly selected 25 employees and measured their computer skills before and after the training program. To test the hypothesis, H₀: µ₁ = µ₂, the test statistic is a: A) z-statistic. B) t-statistic with 49 degrees of freedom. C) t-statistic with 23 degrees of freedom. D) chi-square statistic with 23 degrees of freedom.
Sagot :
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