Levels of groups’ certainties about their eyewitness testimony to a simulated cr
ID: 3259055 • Letter: L
Question
Levels of groups’ certainties about their eyewitness testimony to a simulated crime were compared. The first group was set up to be “right” in its eyewitness accounts and the second group was set up to be “wrong”; the desire was to see if confidence differed across groups. Thirty-four participants were recruited from a college campus and randomly divided into two groups, both of which were shown a video of a crime scenario (length: 58 seconds) in which the perpetrator’s facial characteristics (with respect to the camera) were clearly visible at two separate points and sporadically visible at others. Half the participants then were shown a five-individual lineup that contained the perpetrator in the video (“Group A”), and half the participants were shown a five-individual lineup that did not contain the perpetrator (“Group B”). Participants were asked to (a) identify if and where the perpetrator was in the lineup and (b) provide a rating of confidence on a scale from 1 to 10 (10 being highly confident) that the selection was the same as the person seen in the video committing the crime. All participants signed consent forms, were told they could leave the study at any time, and were told they would be debriefed. Data on the confidence ratings are shown below
Group A Confidence Mean- 7.235
7+10+9+10+8+5+10+10+1+10+5+6+7+6+4+5+10/17= 7.235
Group B Confidence Mean- 7.235
10+5+5+10+7+6+10+9+3+6+4+10+10+10+3+7+8/17= 7.235
t-Test: Two-Sample Assuming Equal Variances
Variable A
Variable B
Mean
7.235294118
7.235294118
Variance
7.316176471
6.816176471
Observations
17
17
Pooled Variance
7.066176471
Hypothesized Mean Difference
0
DF
32
t Stat
0
P(T<=t) one-tail
0.5
t Critical one-tail
1.693888748
P(T<=t) two-tail
1
t Critical two-tail
2.036933343
A. Explain your interpretation of the data. In other words, based on your results, what do you think the data mean? What are the potential implications of this data for the stakeholders? What do these results mean for future research into the topic area?
B. Justify the data analysis procedures you used to reach your interpretation.
t-Test: Two-Sample Assuming Equal Variances
Variable A
Variable B
Mean
7.235294118
7.235294118
Variance
7.316176471
6.816176471
Observations
17
17
Pooled Variance
7.066176471
Hypothesized Mean Difference
0
DF
32
t Stat
0
P(T<=t) one-tail
0.5
t Critical one-tail
1.693888748
P(T<=t) two-tail
1
t Critical two-tail
2.036933343
Explanation / Answer
ANS
HERE WE KNOW THAT THE TWO SAMPLE MEAN MEAN IS GIVEN AND RESULT IS CALCULATED
WHICH SHOWS THAT GROUP A MEAN =7.235294118
AND GROPU B MEANS= 7.235294118
AND HERE WE WANT TO TEST THE HYPOTHESISHO;GROUP A POPULATION MEAN(MEU1)=GROUP B POPULATION MEAN (MEU2)
H1;ROUP A POPULATION MEAN(MEU1) IS NOT EQUAL TO GROUP B POPULATION MEAN (MEU2)
AND BY TABLE T-CALCULATED IS ZERO AND WE SEE THAT THIS T -CALCULATED IS LESS THAN T-TABLULATED(2.0369) WITH TWO TAILED HYPOTHESIS SO HYPOTHESIS HO DO NOT REJECT
AND s mean for future research into the topic area IS ALMOT BE SAME AND HYPOTHESIS DO NOT REJECT
AS THE PAST DATA IS OBTAINED
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