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:
Artificial Intelligence
The simulation of human intelligence processes by machines, especially computer systems, including learning, reasoning, and self-correction.
Trait Approach
A theory of leadership that suggests certain personal qualities and characteristics are inherent in great leaders.
Leadership Research
The scholarly study of leadership as a process and phenomenon, exploring various styles, effects, and contexts of leadership.
Contemporary Leadership
Modern leadership approaches that focus on adapting to changing environments, incorporating ethical considerations, and leveraging diversity and innovation.
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