Cost of Textbooks
The editor of a higher education book publisher claims that a large part of the cost of books is the cost of paper.This implies that larger textbooks will cost more money.As an experiment to analyze the claim,a university student visits the bookstore and records the number of pages and the selling price of twelve randomly selected textbooks.These data are listed below. 
-{Cost of Textbooks Narrative} Interpret the value of the slope of the regression line.
Definitions:
Illegal Immigrants
People who enter or reside in a country without the proper authorization or documentation from that country's government.
Educational Levels
The stages of formal learning, typically categorized by degrees or certifications obtained.
Annual Population Growth
measures the rate at which a population increases in size over a one-year period, considering births, deaths, and migration.
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