A researcher wants to determine whether the means of two independent populations are the same.She has two independent random samples,one from each population,shown in the following table: 
She uses the Mann-Whitney U test and a significance level of 0.05.Then σU is ______.
Definitions:
Lower Labor Standards
The degradation or reduction of labor standards concerning wages, working conditions, and employees' rights.
Free Trade Area
A free trade area is a region where a group of countries have signed a free-trade agreement, reducing or eliminating trade barriers among them.
Labor Mobility
The ease with which workers can move between jobs, regions, or industries, often influencing economic efficiency and worker welfare.
Fiscal Policies
Governmental measures related to tax, spending, and borrowing aimed at influencing a country's economy.
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