Discuss the effect of leading questions on eyewitness testimony

AIM: This study looks to replicate previous findings of the effect of leading questions on eyewitness testimony Between-subjects experimental design o IV: Leading Question Severity (2 levels: went and smashed) o DV: Speed estimate Hypothesis: Formulate a Uni-directional OR a bi-directional hypothesis compatible with the literature reviewed in the introduction Identify the level of measurement of the IV & DV (ordinal, categorical, interval , ratio) Known Derive The Data DV IV Demographic data Data in excel file: Lab Report 2: Data Set In SPSS Variable View window check: 1. IV: group/condition 1& 2 in ‘Values’ column 2. Gender: M=0; F=1 in ‘Values’ column 3. Variables: all have the correct measurement level (Ordinal, Nominal, Scale for interval) in ‘Measure’ column Import data into an SPSS file ❑ Run descriptive statistics (by group): ▪ Are the groups variances similar? (rule of thumb-their ratio less than 4:1) ❑ Plot the histograms of the DV (by group): ▪ Are the distributions symmetrical? (checking for normality inspecting the histogram is acceptable) ▪ You can test normality with Kolmogorov Smirnov – not required (Hint: use Explore function in SPSS) ❑ Plot the boxplots of the DV (by group): ▪ Are there extreme outliers? You need to decide how to deal with them. Your decision needs to be explained and justified in ‘Results’ Getting ready for analyzing the data: check parametric assumptions Decide the test Decide the test based on: ❑ Design: CorrelationalExperimental ❑ Independent Variable: levels ❑ Experimental design: WithinBetween subjects ❑ Assumptions on data: Parametric/Non-parametric All these choices must be explained and justified in ‘Results’ RUN THE TEST IN SPSS Report the Results ❑Start the ‘Results’ section by introducing your data  Normally distributed?  Groups with equal/unequal variance?  Outliers? How did you deal with them? If you decide to include histograms and/or boxplots, present them in Appendix. If you include the graphs in Appendix, you need to refer to them in ‘Results’ Report the Results ❑ Illustrate and comment the pattern of results: report descriptive statistics  Descriptives can be presented: in-text OR in Table OR with the appropriate graph o If you decide to use a graph to report means and standard deviations, this has to be presented in ‘Results’ (not in Appendix) o Figures need to have axes appropriately labelled (ie; the correct variable names: FOR EXAMPLE: Mean Reaction Time of correct response in milliseconds; Reading group/Control group) o Error bars need to be included in graphs. Specify if these are Confidence intervals, Standard Errors or Standard Deviations ❑ Introduce the test. ▪ For example: Data met (did not meet) parametric assumptions (insert description of your data). A ……. Test was performed to test the hypothesis ….. ❑Report the results (inferential statistics) in APA style Report the Results Full report including all sections Word length = 2000 words ±10%