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:
Temperament
The aspect of an individual’s personality concerning inherent emotional and behavioral patterns.
Breastfeeding
The method of feeding a baby with milk directly from the mother's breast, providing nutrition and promoting bonding between mother and child.
Demand Feeding
A method of feeding infants where the caregiver feeds the baby whenever the baby shows signs of hunger, rather than adhering to a strict feeding schedule.
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