![]() ![]() If left uncontrolled, any of these variables could affect how much a participant is willing to spend on a meal, making it difficult to determine the true impact of advertising color on the meal’s value. Participant’s familiarity with the specific fast food brand,.Participant’s frequency of buying fast food,.Study environment (e.g., temperature or lighting),.Example: Extraneous variablesIn your experiment about advertising color and meal value, extraneous variables include: For strong internal validity, you need to remove their effects from your experiment. ![]() A controlled experiment is the strongest way to test whether advertising color really changes how much customers are willing to pay.Įxtraneous variables are factors that you’re not interested in studying, but that can still influence the dependent variable. There are many factors that could influence the value of a meal.
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