Experimental method

• What is the purpose of the experimental method in psychology?

  To manipulate an independent variable (IV)
• What is the aim of a psychological investigation?

  To describe the purpose of the study
• What is a hypothesis?

  A testable statement about variables
• How does a directional hypothesis differ from a non-directional hypothesis?

  It specifies the expected direction of difference
• What is the independent variable (IV) in the energy drink study?

  The type of drink consumed by participants
• What is the dependent variable (DV) in the energy drink study?

  The number of words participants say
• Why is it important to keep other variables constant in an experiment?

  To ensure changes in DV are due to IV
• What are the two levels of the independent variable in the energy drink study?

  • Control condition: No Speedupp / water
  • Experimental condition: Drinking Speedupp
• How should a well-written hypothesis relate to the IV and DV?

  It should clearly state both variables
• What does operationalisation of variables mean?

  Defining variables for measurement clarity
• How can the hypothesis be improved for clarity?

  By specifying the amount of Speedupp consumed
• What is the operationalised hypothesis for the energy drink study?

  Participants say more words after Speedupp
• Why is it important to count the words spoken in the study?

  To measure the effect of the energy drink