Two coffee-vending machines are studied to determine whether they distribute the same amounts. Samples are taken and the number of ounces is recorded for each machine. 
What is the test statistic T?
Definitions:
E-marketplace
An online platform where buyers and sellers can exchange goods and services, characterized by its ease of access and broad reach.
Independent Trading Communities
Groups or networks of individual traders, investors, or small businesses that operate independently, often focused on specific markets or commodities.
Online Buying
The process of purchasing goods or services over the internet through digital platforms and websites.
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