Examlex
Random selection is a process in which participants are selected randomly from a larger group such that every group member has an equal chance of being included in the study.
Null Hypothesis
A default position that there is no association between two measured phenomena or no difference among groups being compared.
Two-Tailed Test
A statistical hypothesis test in which the critical area for a distribution is two-sided and tests whether a sample is greater than or less than a certain range of values.
Sample Proportions
The fraction of items in a sample that are of a particular type.
Standard Error
A measure of the standard deviation of the sampling distribution of a statistic, often used in the estimation of confidence intervals.
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