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A Study by a Bank Compared the Average Savings of Customers

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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: 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? To test that the two groups of customers have equal savings rates, what is the critical value of z using α = 0.05?

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