The following data represent a random sample of bank balances for a population of checking account customers at a large eastern bank. Based on these data, what is the critical value for a 95 percent confidence interval estimate for the true population mean? 
Definitions:
Union Membership
The state of belonging to a labor union, which is an organization that represents the collective interests of workers in negotiations with employers regarding wages, working conditions, and benefits.
Strikes
A work stoppage caused by the mass refusal of employees to work, usually to protest employer policies, working conditions, or compensation.
Industrial Union
A union representing all the workers in a single industry, regardless of each worker’s skill or craft.
Teamsters' Union
A labor union in the United States and Canada primarily representing workers in the transportation and logistics industries.
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