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Why did the Pullman porters organize into a union? How did they address difficulties presented by white-owned corporations?
Standard Deviation
An indicator of the degree of variation or spread among a collection of numbers.
Confidence Interval
A range of values, derived from the sample data, that is likely to contain the value of an unknown population parameter with a specified level of confidence.
Monthly Incomes
The total amount of income or earnings received during a typical month, often used in financial and socioeconomic studies.
Variances
Measures of the dispersion, indicating how spread out the data points are around the mean.
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