Controlling for Extraneous Variables: Single Blind, Double Blind & Placebo Methods


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question 1 of 3

An extraneous variable is not the _____, but still affects the _____.

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1. When a person feels better just because they are given a treatment, even if that treatment doesn't do anything, it is called a _____.

2. Amber designs a study and doesn't tell her participants whether they are in the control group or the experimental group. Which of the following terms best describes Amber's study?

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About This Quiz & Worksheet

Researchers use several strategies to keep extraneous variables from affecting their studies. This quiz/worksheet will help you assess your understanding of those strategies and how they work to counter extraneous variables.

Quiz & Worksheet Goals

The quiz and worksheet examine:

  • Extraneous variables
  • The term for when a participant gets an effect from a bogus treatment
  • Single and double-blind studies
  • Which group does not receive the experimental manipulation

Skills Practiced

These resources will help you practice:

  • Distinguishing differences - compare and contrast single and double blind studies
  • Information recall - access the knowledge you've gained regarding the effect of extraneous variables
  • Reading comprehension- ensure that you draw the most important information on the effect a participant experiences from a treatment that isn't really a treatment from the related lesson

Additional Learning

Read the lesson titled Controlling for Extraneous Variables: Single Blind, Double Blind & Placebo Methods for further detail on these research techniques. With this lesson, you will be able to accomplish these learning goals:

  • Define treatment group
  • Understand what single and double blind studies entail
  • Identify the independent and dependent variables