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Z-statistic
A type of standard score that represents the distance in standard deviations a data point is from the mean, used in significance testing.
Two-tailed Test
A statistical test that considers both directions of a possible effect, testing for the possibility of an effect in two opposite directions.
Z-test
A statistical test used to determine whether two population means are different when the variances are known and the sample size is large.
µ = 15
Represents the mean of a population is equal to 15.
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