If an observed z or t score is greater than the critical value,we would reject the null hypothesis.

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This is true for both z-tests and t-tests. The critical value represents the cutoff point for the level of significance chosen for the hypothesis test (usually p < .05). If the observed z or t score exceeds the critical value, the result is statistically significant and we reject the null hypothesis.

If an Observed Z or T Score Is Greater Than