It is extremely important for a researcher to clearly define the variables in a study because this helps to determine the type of analysis that can be performed on the data. For example, if a researcher wanted to describe countries based on ISBN (International Standard Book Number) group identifier, what level of measurement would the variable "ISBN group identifier" be? Now suppose the researcher felt that certain countries with a larger total area received higher identifying numbers. Does t of measurement of the variable change? If so, how? What is the level of measurement of the variable "ISBN group identifier" in the original scenario? O Nominal O Ordinal O Ratio O Interval Does the level of measurement of the variable change in the second scenario? Select the correct choice below and, if necessary, fill in the answer box within your choice. O A. Yes, it changes to O B. No, it stays the same