You have a 2x2 Independent Groups Factorial Design. You are interested in whether caffeine intake (none versus 2 cups of coffee) and age (18 years old versus 40 years old) interact to predict level of alertness. How many different groups of people would you need to satisfy the design?   1 2 3 4

MATLAB: An Introduction with Applications
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7. You have a 2x2 Independent Groups Factorial Design. You are interested in whether caffeine intake (none versus 2 cups of coffee) and age (18 years old versus 40 years old) interact to predict level of alertness. How many different groups of people would you need to satisfy the design?
 
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