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: 
What is the computed test statistic? Round to two decimal places.
Definitions:
Marketing Costs
The expenses associated with promoting and selling products or services, including advertising, market research, and distribution.
Misuse Of Market Power
The practice where a business with significant market power engages in conduct that prevents or diminishes competition in a market.
Antitrust Violation
Actions or practices that unfairly restrain competition and control prices, in violation of antitrust laws.
Restrain Trade
Practices that limit competition or control market prices, often viewed as contrary to free-market operations.
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