Examlex
When would it be appropriate for a researcher to use an experimental design as opposed to a nonexperimental design?
One-Tail Test
A statistical test where the region of rejection is on only one side of the sampling distribution, used when the research hypothesis predicts a direction of the effect.
Two-Tailed Test
A hypothesis testing approach that allows for the possibility of an effect in two directions, either higher or lower than the null hypothesis, and hence tests for the presence of any significant difference.
Test Statistic
A calculated value that is used in statistical tests to determine whether to reject the null hypothesis, based on sample data.
P-Value
The probability of getting the observed value of the test statistic, or one more extreme, assuming the null hypothesis is true.
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