Psychology HL P2 - INTERNATIONAL BACCALAURAT BACHILLERATO...

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MARKSCHEME May 2001 PSYCHOLOGY Higher Level Paper 2 28 pages M01/350/H(2)M INTERNATIONAL BACCALAUREATE BACCALAUR°AT INTERNATIONAL BACHILLERATO INTERNACIONAL
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[2 marks] 1. State two features of the design of this investigation which make it a true experiment. Mention of control of the independent variable and random allocation of participants to conditions/groups would suffice. [1 mark] for either of these. None for irrelevant points, such as ±it tests a hypothesis² or ±it is controlled². ±There is an independent variable² would not obtain a mark on its own but might do so if accompanied by some wording which implies experimenter control. Candidates might choose to describe the logic of controlling all variables bar one - which can obtain [2 marks] if more than one major relevant point is made. [1 mark] 2. State the type of experimental design used in this investigation. Any one of: Independent samples/groups/subjects/participants; Between subjects/groups/ participants. More general answers ( e.g . ±it is a true experiment²) should not receive a mark. [2 marks] 3. Briefly describe one advantage of the experimental design used in this investigation. Even if the candidate mentioned the wrong design in the previous question, answers to this question should depend upon the actual design as described in the scenario. Give [1 mark] for the mention (only) of an advantage and the extra mark for a description of why it is an advantage. Possible advantages are: lack of order effects, can use identical materials in each condition ( e.g. no need for equivalent word lists), participant drop-out incurs loss of only one result. There may be other valid points but answers such as ±less expensive² or ±less time consuming² should not be awarded a mark since this depends on other factors. [2 marks] 4. Briefly describe one disadvantage of the experiment design used in this investigation. Even if the candidate mentioned the wrong design in question 2, answers to this question should depend upon the actual design as described in the scenario. Participant (or subject) variables (meaning groups may not be equivalent; participant differences may confound results). Again [1 mark] for only a mention of a disadvantage but [2 marks] for an adequate description. Give marks for other valid disadvantages but, as above, not any concerning time or expense. ³ 3 ³ M01/350/H(2)M
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[2 marks] 5. State the independent variable in this experiment and give a reason for your answer. Hungry vs. satiated; because this is the variable manipulated by the experimenter or similar. [1 mark] for each part. Give a mark where the wrong variable is selected but a valid definition of an independent variable is provided. [3 marks] 6. State the two dependent variables measured in this experiment and give a reason for your answer.
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