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1. If in truth, the program is effective and we reject the null hypothesis, which error did we commit?
2. If in truth, the program has no effect and we fail to reject the null hypothesis, which error did we commit?
3. If in truth, the program has no effect and we reject the null hypothesis, which error did we commit?
4. If in truth, the program is effective and we fail to reject the null hypothesis, which error did we commit?
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