The college of business was interested in comparing the attendance for three different class times for a business statistics class. The data follow. 
What is the blocking variable?
Definitions:
Executive Power
The authority granted to government executives, such as presidents or governors, to enforce laws and manage the administration of government.
U.S. Constitution
The supreme law of the United States that outlines the national frame of government and the fundamental rights of its citizens.
Judicial Decisions
Legal determinations made by a court regarding a matter in dispute, which serve as an authoritative rule or precedent in future, similar cases.
Interstate Commerce
Commercial transactions or the movement of goods and services across state lines, which can be regulated by the federal government.
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