Examlex
Compare the aims and achievements of the Knights of Labor, the American Federation of Labor, and the Industrial Workers of the World. What common ground do they share? What factors help explain their differences?
Z-test
A statistical test used to determine if there is a significant difference between sample and population means, assuming the population variance is known.
Chi-squared Test
The Chi-squared test is a statistical method used to determine if there is a significant difference between the expected and observed frequencies in one or more categories.
Test Statistic
A quantity derived from sample data used to make a decision about a hypothesis test.
Z
'Z' often represents the Z-score in statistics, which is the number of standard deviations a data point is from the mean of the data set.
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