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The experimental method

b) Explicitly state the independent variables that are to be altered

Independent variables

the things you control (independent of how a subject behaves)

two different kinds:

treatment manipulated (can establish cause/effect, true experiment)

subject individual differences (can never fully establish cause/effect)

in toothpaste experiment

toothpaste type: uses Crest or No-teeth toothpaste

age: <= 12 years or  > 12 years

in menu experiment

menu type: pop-up or pull-down

menu length: 3, 6, 9, 12, 15

expertise: expert or novice

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