Eyewitnesses and mug shots. Applied Psychology in Criminal Justice (April 2010) published a study of mugshot choices by eyewitnesses to a crime. Each in a sampleof 96 college students was shown a video of a simulatedtheft, then asked to select the mug shot that most closelyresembled the thief. The students were randomly assignedto view either 3, 6, or 12 mug shots at a time, with 32 studentsin each group. The number of students in the 3-, 6-, or12-photos-per-page groups who selected the target mugshotwere 19, 19, and 15, respectively.
a. For each photo group, compute the proportion of students who selected the target mug shot. Which group yielded the lowest proportion?
b. Create a contingency table for these data, with photo group in the rows and whether or not the target mug shot was selected in the columns.
c. Refer to, part b . Are there differences in the proportions who selected the target mug shot among the three photo groups? Test using α = .10.
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