Independent random samples of managers' yearly salaries (in $1000) taken from governmental and private organizations provided the following information. At 95% confidence, test to determine if there is a significant difference between the average salaries of the managers in the two sectors. 
Definitions:
Union Shops
Workplaces where employment is conditional on maintaining membership in a labor union, typically after a probationary period.
Open Shops
Workplaces where joining a union is not a condition for employment, allowing for both union and non-union employees.
Pure Monopsony Power
A market condition where there is only one buyer for a product or service, giving that buyer significant control over prices.
Strike and Lockout
Labor disputes where employees refuse to work (strike) and employers prevent employees from working (lockout) to settle disagreements, typically over employment terms.
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