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RISKY SHIFT: LAB REPORT WRITE-UP

RISKY SHIFT: LAB REPORT WRITE-UP. Week 7 Practical. RISKY SHIFT. WEEK 7 PRACTICAL. LECTURE. PRACTICAL. WEEK 1. NO LECTURE. NO PRACTICAL. WEEK 2. NONPARAMETRICS 1. 1 ST PRACTICAL. WEEK 3. NONPARAMETRICS 2. 1 ST ANALYSIS. WEEK 4. 1 ST ANALYSIS (BY HAND). SAMPLING DISTRIBUTIONS.

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RISKY SHIFT: LAB REPORT WRITE-UP

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  1. RISKY SHIFT: LAB REPORT WRITE-UP Week 7 Practical

  2. RISKY SHIFT WEEK 7 PRACTICAL LECTURE PRACTICAL WEEK 1 NO LECTURE NO PRACTICAL WEEK 2 NONPARAMETRICS 1 1ST PRACTICAL WEEK 3 NONPARAMETRICS 2 1ST ANALYSIS WEEK 4 1ST ANALYSIS (BY HAND) SAMPLING DISTRIBUTIONS WEEK 5 2ND PRACTICAL HYPOTHESIS TESTING WEEK 6 2ND ANALYSIS WEEK 7 2ND ANALYSIS (BY HAND) RELATED T-TEST WEEK 8 3RD PRACTICAL INDEPENDENT T-TEST WEEK 9 3RD ANALYSIS INDEPENDENT ANOVA WEEK 10 DEPENDENT ANOVA NO PRACTICAL

  3. RISKY SHIFT LEARNING OUTCOMES BY THE END OF THE SESSION, YOU SHOULD BE ABLE TO: Understand the way in which the practical reports will be marked and what you have to do to do well! Learn to calculate the Friedman and Wilcoxon test by hand. Clarify any additional problems that you may have regarding this lab report with your friendly neighbourhood demonstrators.

  4. RISKY SHIFT PRACTICAL WRITE-UP 2 IV and DV included, precise, concise TITLE 12 Maximum 150 words, summary of all sections ABSTRACT 20 Clear structure leading to experimental rationale INTRODUCTION Evidence of extra reading, beyond the handouts 20 Sufficient information to replicate the study METHOD Participants, materials, design, procedure 20 Clear and logical descriptive and inferential stats RESULTS Well designed figures related to the findings 20 Summary of main results, relating to introduction DISCUSSION Evaluation of study, suggestions for future 6 APA formatted, consistent with references in text REFERENCES 0 Handouts, SPSS printouts, workings out… APPENDICES

  5. RISKY SHIFT REMINDER: FRIEDMAN

  6. RISKY SHIFT FRIEDMAN BY HAND First you should complete the “How to carry out a Friedman Test” worksheet. We will go through this with you. For ease, you will be working with a small data set rather than the Risky Shift data set. You will need to attach the completed worksheet to your lab report.

  7. RISKY SHIFT FRIEDMAN BY HAND STEP 1: Rank each participant's scores individually

  8. RISKY SHIFT FRIEDMAN BY HAND STEP 1: Rank each participant's scores individually

  9. RISKY SHIFT FRIEDMAN BY HAND STEP 2: Calculate the rank total for each condition

  10. RISKY SHIFT FRIEDMAN BY HAND STEP 2: Calculate the rank total for each condition

  11. RISKY SHIFT FRIEDMAN BY HAND STEP 3: Square the rank totals and add them together ƩTc² =

  12. RISKY SHIFT FRIEDMAN BY HAND STEP 3: Square the rank totals and add them together ƩTc² = 834.5

  13. RISKY SHIFT FRIEDMAN BY HAND STEP 4: Answer the following questions:- • How many conditions? C = • How many participants? N =

  14. RISKY SHIFT FRIEDMAN BY HAND STEP 4: Answer the following questions:- • How many conditions? C = 3 • How many participants? N = 8

  15. RISKY SHIFT FRIEDMAN BY HAND STEP 5: Enter the values for ‘N’, ‘C’ and ‘ƩTc²’ into the formula below N = 8 C = 3 ƩTc² = 834.5

  16. RISKY SHIFT FRIEDMAN BY HAND STEP 5: Enter the values for ‘N’, ‘C’ and ‘ƩTc²’ into the formula below

  17. RISKY SHIFT FRIEDMAN BY HAND STEP 5: Enter the values for ‘N’, ‘C’ and ‘ƩTc²’ into the formula below

  18. RISKY SHIFT FRIEDMAN BY HAND STEP 6: Calculate the degrees of freedom df = C – 1 df = STEP 7: Determine statistical significance Assessing the statistical significance of r² depends on the number of participants and the number of groups. a) Less than 9 participants = Use a special table of critical values (on Graham’s website) b) 9 or more participants = Use a Chi-Square table (on Graham’s website) Χr² ( ) = , p

  19. RISKY SHIFT REMINDER: WILCOXON

  20. RISKY SHIFT WILCOXON BY HAND Now you should complete the “How to carry out a Wilcoxon Test” worksheet. Again, we will go through this with you. You will be working with a small data set again rather than the Risky Shift data set. You will need to attach the completed worksheet to your lab report.

  21. RISKY SHIFT WILCOXON BY HAND STEP 1: Calculate the difference between scores

  22. RISKY SHIFT WILCOXON BY HAND STEP 1: Calculate the difference between scores

  23. RISKY SHIFT WILCOXON BY HAND STEP 2: Rank the differences

  24. RISKY SHIFT WILCOXON BY HAND STEP 2: Rank the differences • Ignore the sign of the difference (whether it is positive or negative) • If more participants have the same difference • Add up the ranks they would take • Divide this by the number of ranks • For example: -1 is the lowest difference, of which there are 4. Add up the ranks: 1 + 2 + 3 + 4 = 10, then divide this by the number of ranks: 10 / 4 = 2.5 • Ignore differences of zero

  25. RISKY SHIFT WILCOXON BY HAND STEP 2: Rank the differences

  26. RISKY SHIFT WILCOXON BY HAND STEP 3: Add together ranks belonging to scores with a positive sign

  27. RISKY SHIFT WILCOXON BY HAND STEP 3: Add together ranks belonging to scores with a positive sign

  28. RISKY SHIFT WILCOXON BY HAND STEP 4: Add together ranks belonging to scores with a negative sign

  29. STEP 5: Determine value of W • Positive sign ranks: 5.5+7.5 = 13 • Negative sign ranks: 7.5+2.5+2.5+9+2.5+2.5+5.5+10+11=53 • W-value is the smallest of these sums

  30. STEP 6: Determine N • N = Number of differences • Omit zero differences • 12 -1 = 11 differences

  31. STEP 7: Check critical value

  32. RISKY SHIFT YOUR CHOICE YOU HAVE THE REST OF THE SESSION TO FOCUS ON WHAT YOU THINK YOU NEED TO IMPROVE YOUR UNDERSTANDING LAB REPORT NONPARAMETRICS Make sure you are happy with your interpretation of the SPSS output in relation to the three experimental hypotheses ,and make sure you know what needs to go into your lab report to get the best marks. Download ‘problem5’ and start to work through the questions related to the forthcoming related t-test (as well as some problems relating to correlation and regression).

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