Which of the Following Techniques or Actions Represents Constancy in Data

question 14

Multiple Choice

Which of the following techniques or actions represents constancy in data collection for control of extraneous variables in a study examining the effect of hormone replacement therapy on bone density loss in postmenopausal women?

• A) Drawing blood from all subjects at the same time of day
• B) Always having the same nurse or phlebotomist always draw blood from all subjects
• C) Using the same room for drawing blood from all subjects
• D) Ensuring that all subjects are postmenopausal women taking hormone replacement therapy

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Definitions:

Pure Command Economy

An economic system where all production, investment, prices, and incomes are controlled by the government.

Privately Owned

Refers to properties, businesses, or assets that are owned by individuals or private companies and not by the state or public entities.

Price System

A mechanism through which prices adjust to balance supply and demand for goods and services in an economy.

Centralized Planning

A system of economy where all choices related to the creation and allocation of goods and services are made by a central governmental body.