1. RISKY SHIFT: INTRODUCTION Week 5 Practical

2. WEEK 5 PRACTICALRISKY SHIFT WEEK 1 WEEK 2 WEEK 3 WEEK 4 WEEK 5 WEEK 6 WEEK 7 WEEK 8 WEEK 9 WEEK 10 LECTURE 1PRACTICAL NONPARAMETRICS 11 ST PRACTICAL NONPARAMETRICS 21 ST ANALYSIS SAMPLING DISTRIBUTIONS 1 ST ANALYSIS + PROBLEMS 1 HYPOTHESIS TESTING 2 ND PRACTICAL RELATED T-TEST 2 ND ANALYSIS + SOLUTIONS 1 INDEPENDENT T-TEST INDEPENDENT ANOVA DEPENDENT ANOVA 2 ND ANALYSIS + PROBLEMS 2 3 RD PRACTICAL 3 RD ANALYSIS + SOLUTIONS 2 3 RD ANALYSIS + PROBLEMS 3 NO LECTURENO PRACTICAL

3. Begin to explore the downloaded data set with respect to testing the experimental hypotheses using an appropriate test. Appreciate the way in which the study was carried out and the hypotheses the study is testing. Conduct the Risky Shift practical and understand the rationale behind the experiment. BY THE END OF THE SESSION, YOU SHOULD BE ABLE TO: Make a start on writing up your INTRODUCTION and METHOD sections for your lab report. WEEK 5 PRACTICALRISKY SHIFT

4. Work alone, making sure you have a handout and something to write with. Read the PRE questionnaire instructions before filling out the questionnaire itself. When you have finished the PRE questionnaire, wait for further instructions. You will have 10 minutes to answer the questionnaire, so think carefully! RISKY SHIFTPART 1

5. EXPERIMENT RISKY SHIFT

6. Take a seat in the group that has been assigned to you. Discuss each of the five situations and reach a unanimous decision for each one. After reaching your decisions, complete the GROUP questionnaire and wait for further instructions. You will have 10 minutes to do this, so discuss carefully (2 minutes on each). RISKY SHIFTPART 2

7. EXPERIMENT RISKY SHIFT

8. Work alone again, making sure you have a handout and something to write with. You are now invited to complete the POST questionnaire. When you have finished the POST questionnaire, wait for further instructions. You will have 10 minutes to answer the questionnaire, so think carefully again! RISKY SHIFTPART 1

9. EXPERIMENT RISKY SHIFT

10. INTRODUCTION (Kenrick, Neuberg and Cialdini, 2002) A phenomenon that is observed when discussions lead group members to make riskier decisions than they would as individuals. WELCOME TO THE RISKY SHIFT! RISKY SHIFT Post decisions riskier than the pre decisions (overt compliance). Risky shift was evident 2-6 weeks after the group discussion. (Stoner, 1961; Wallach, Kogan and Bem, 1962) One possible explanation is diffusion of responsibility which is the tendency for each group member to dilute personal responsibility for acting by spreading it among all the other group members. People feel less responsble about the decisions taken and attribute blame if things go wrong to the decisions made in group.

11. HYPOTHESES Our current experiment raises three hypotheses (after Wallach et al., 1962) METHOD Q3: Is the average level of risk recorded in the POST assessment different from the risk recorded in the PRE assessment? Q2: Is the average level of risk recorded in the PRE assessment different from the risk recorded in the GROUP assessment? DESIGN We have ratings collected from a within-subjects design using 3 levels. RISKY SHIFT PREGROUPPOST Q1: Is the average level of risk different across the PRE, GROUP and POST assessment?

12. PARTICIPANTS To help the write-up along, we will use (cough) ‘massaged’ data. METHOD So here is some demographic information that might be useful. DOWNLOAD AND SAVE THE FILE ‘RISKY SHIFT PRACTICAL 2009 SPSS DATA' RISKY SHIFT [Once again, for the purposes of the write-up, the sample was taken from an opportunity sample of students found at the University of Sussex.] 24 female, 24 male; Age range: 18-32 years; Mean: 24 years; S.D.: 2.8 years Participants were divided up into 8 groups of 6 and an equal number of males and females were allocated to each group. DOWNLOAD AND SAVE THE FILE ‘RISKY SHIFT DEBRIEF AND BACKGROUND’

13. DESIGN You’ll notice some neat things about the design of the questionnaire: METHODRISKY SHIFT Ratings are scores 1 to 11, with 1 being the most risky and 11 the least risky. Critically for questionnaire design, the order in which the options are presented is reversed for (about) half of the items. 1 3 5 7 9 11 9 7 5 3 1 RISK SCORE

14. RESULTS The first 2 columns show subject id and group membership. These columns show mean risk score at PRE, GROUP and POST. RISKY SHIFT You will also find average risk scores for each example collapsed over PRE, GROUP and POST.

15. NOTES FOR WRITE UP INTRODUCTION METHOD Like a funnel- all roads should lead to the rationale for the experiment. What were the previous studies that lead up to the current one? What were the important psychological concepts and / or distinctions? What was the outline of the current study and what were the hypotheses? Must include enough detail for someone else to replicate the experiment. Standard structure: Participants / Materials / Design / Procedure. Refer the reader to appendices if including lengthy materials (hint hint). Avoid bullet points or lists because the method section is prose too. RISKY SHIFT

16. Begin to explore the downloaded data set with respect to testing the experimental hypotheses using an appropriate test. Appreciate the way in which the study was carried out and the hypotheses the study is testing. Conduct the Risky Shift practical and understand the rationale behind the experiment. BY THE END OF THE SESSION, YOU SHOULD BE ABLE TO: Make a start on writing up your INTRODUCTION and METHOD sections for your lab report. WEEK 5 PRACTICALRISKY SHIFT

17. DISCUSSION GET TOGETHER IN GROUPS OF THREE OR FOUR AND REFLECT ON TODAY’S EXPERIENCE USING THE FOLLOWING QUESTIONS What kind of statistical test might you use next week and why? If you were to carry out the experiment again, what would you change? Could you overhear other groups? Were there other problems in the way the experiment was carried out? RISKY SHIFT