SCENARIO.
You are interested in whether changing the format of a lineup will affect the accuracy of eyewitness identification in children and adults. Specifically, you want to know if individuals perform differently on three types of lineups: a standard simultaneous lineup (the witness views all individuals in the lineup at the same time and is asked whether he or she recognizes anyone), a fast elimination lineup (the witness is told to look at the lineup and pick out the person who looks most like the suspect), and a slow elimination lineup (the witness is told to eliminate individuals from the lineup who do not look like the suspect). You are interested in the rates of correct identifications (correctly identifying the suspect),
• Write an alternative and null hypothesis. H1 and Ho .
• Identify the most appropriate experimental design (e.g., single-factor or factorial) and explain how exactly it qualifies as that type of design.
• Specify precisely what the independent variable(s) will be, and how they will be manipulated. Also, specify the number of levels of each independent variable if appropriate.
• Specify exactly what the dependent variable(s) will be, and the operational definition for the variable as well as how it will be quantified.
• Specify the procedures that will be followed (e.g., how participants will be obtained, where the experiment will be run, what exactly will take place).This should be detailed enough to clearly illustrate what the manipulation is in the experiment and exactly how the experiment would work.
• Indicate what, if anything, would be done to control extraneous variables and eliminate confounding variables. • Indicate if the experiment could be run as a within-subjects or matched-groups design. If so, what would the matching variables be and why?