TABLE 11-11
A student team in a business statistics course designed an experiment to investigate whether the brand of bubblegum used affected the size of bubbles they could blow.To reduce the person-to-person variability,the students decided to use a randomized block design using themselves as blocks.
Four brands of bubblegum were tested.A student chewed two pieces of a brand of gum and then blew a bubble,attempting to make it as big as possible.Another student measured the diameter of the bubble at its biggest point.The following table gives the diameters of the bubbles (in inches) for the 16 observations. 
-Referring to Table 11-11,what is the null hypothesis for testing the block effects?
Definitions:
Partnership
A legal form of business operation between two or more individuals who share management and profits.
Industrial Revolution
A period of major industrialization that took place during the late 1700s and early 1800s, dramatically transforming societies from agrarian to industrial.
Specialized Equipment
Machinery or tools designed for a particular purpose or industry, enhancing efficiency and productivity in specific tasks.
Division of Labor
The division of separate components of a manufacturing procedure or task among different individuals for the purpose of increasing efficiency.
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