A parameter is a fixed, specific value that defines a particular aspect of a population. A statistic is a numerical value that is calculated from a sample of data and is used to estimate a population parameter.
Inter and intra both involve relationships, but they vary in their scope. Inter denotes something that exists or occurs between different entities, while intra pertains to something within a single entity or group.
Possum is commonly used to refer to marsupials found in Australia, New Zealand, and nearby islands, and opossum is the term used for marsupials found primarily in the Americas, ranging from North to South America.
Principle refers to a fundamental truth, belief, or rule that serves as a foundation for decision-making. Principal is a noun referring to a person who holds a high position of authority or leadership.