If the research prediction is that the treatment will decrease scores, then the critical region for a directional one-tailed test that uses a z-score statistic will be in the right-hand tail. True or false?

false

Explanation:

In research prediction, the critical region for a directional one-tailed test that uses a Z-score could tilt towards the right hand or the left hand.

If the research shows that there was a stasistically significant change in the two factors compared (treatment would decrease scores), the direction would tilt towards the left when a z-score statistics was used for the prediction.

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