A study by a bank compared the average savings of customers who were depositors for three years or less with those who had been depositors for more than three years. The results of a sample are: 
To test that the two groups of customers have equal savings rates, what is the critical value of z using α = 0.05?
Definitions:
Integrate Suppliers
The process of closely combining the operations, systems, or processes of suppliers with those of the purchasing company to improve efficiency and coordination.
Conduct Activities
The process of organizing, directing, and overseeing actions or operations in various settings or projects.
Balance Sheet
A financial statement that provides a snapshot of a company's financial condition at a specific point in time, including assets, liabilities, and shareholder equity.
Income Statement
A financial document that shows a company's revenue, expenses, and profits over a specific period, providing insight into its operational efficiency.
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