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Margin of Error
A statistic expressing the amount of random sampling error in a survey's results, indicating the confidence in how closely the sample estimates reflect the population.
Sign Test
A nonparametric test used to determine if there is a significant difference between paired observations, by analyzing the signs of differences without assuming any particular distribution.
Median Score
The midpoint value in a set of scores, where half of the scores are above it and half are below, often used as a measure of central tendency.
Level of Significance
A threshold in hypothesis testing that determines whether the null hypothesis can be rejected, often denoted by alpha (α).
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